Camera.java
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artofillusion |
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Art of Illusion |
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| Metric | Description | |
|---|---|---|
| JAVA0177 | JAVA0177 Variable declaration missing initializer |  |
| JAVA0108 | JAVA0108 Incorrect javadoc: no @param tag for 'parameter' | |
| JAVA0076 | JAVA0076 Use of magic number | |
| JAVA0034 | JAVA0034 Missing braces in if statement | |
| OPERANDS | Number of operands | |
| PROGRAM_LENGTH | Halstead program length | |
| OPERATORS | Number of operators | |
| PARAMS | Number of formal parameter declarations | |
| LOGICAL_LINES | Number of statements | |
| JAVA0110 | JAVA0110 Incorrect javadoc: no @return tag | |
| INTERFACE_COMPLEXITY | Interface complexity | |
| DECL_COMMENTS | Comments in declarations | |
| SIZE | Size of the file in bytes | |
| LOC | Lines of code | |
| ELOC | Effective lines of code | |
| JAVA0067 | JAVA0067 Array descriptor on identifier name | |
| UNIQUE_OPERANDS | Number of unique operands | |
| PROGRAM_VOCAB | Halstead program vocabulary | |
| CYCLOMATIC | Cyclomatic complexity | |
| FUNCTIONS | Number of function declarations | |
| JAVA0117 | JAVA0117 Missing javadoc: method 'method' | |
| LINES | Number of lines in the source file | |
| RETURNS | Number of return points from functions | |
| JAVA0078 | JAVA0078 Floating point values compared with == | |
| JAVA0116 | JAVA0116 Missing javadoc: field 'field' | |
| COMPARISONS | Number of comparison operators | |
| JAVA0082 | JAVA0082 Unnecessary widening cast | |
| BLOCKS | Number of blocks | |
| PROGRAM_VOLUME | Halstead program volume | |
| UNIQUE_OPERATORS | Number of unique operators | |
| JAVA0136 | JAVA0136 N methods defined in class (maximum: M) | |
| JAVA0035 | JAVA0035 Missing braces in for statement | |
| JAVA0126 | JAVA0126 Method declares unchecked exception in throws | |
| JAVA0285 | JAVA0285 Dereference of potentially null variable | |
| LOOPS | Number of loops | |
| JAVA0003 | JAVA0003 Minimize use of on-demand (.*) imports | |
| JAVA0145 | JAVA0145 Tab character used in source file | |
/* Copyright (C) 1999-2004 by Peter Eastman
This program is free software; you can redistribute it and/or modify it under the
terms of the GNU General Public License as published by the Free Software
Foundation; either version 2 of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
PARTICULAR PURPOSE. See the GNU General Public License for more details. */
package artofillusion;
import artofillusion.math.*;
import java.awt.*;
/** The Camera class has two functions. First, it keeps track of the transformations
between the various coordinate systems used by the program. These include:
<p>
<ul>
<li>Object Coordinates are used for defining the shape of individual objects. Each object
has its own local coordinate system.</li>
<li>World Coordinates are used for defining the arrangement of objects to form a scene.</li>
<li>View Coordinates describe the positions of objects relative to the viewer.
Specifically, the viewer is considered to be at the origin, and to be looking along the
positive z axis.</li>
<li>Screen coordinates correspond to pixels in the image being generated.</li>
<p>
Second, the camera class is responsible for drawing various simple shapes. These include
straight lines, rectangular boxes, and Bezier curves.
<p>
The Camera class does *not* represent a "camera" which the user creates and positions
within a scene. That is represented by the SceneCamera class. */
public class Camera implements Cloneable
{
private Mat4 objectToWorld, objectToView, objectToScreen, worldToView, worldToScreen;
private Mat4 viewToScreen, viewToWorld;
private double viewDist, distToScreen, scale, frontClipPlane, gridSpacing;
private boolean perspective;
private int hres, vres;
private int lastX, lastY;
private Vec3 lastPoint;
private CoordinateSystem cameraCoords;
public static final double DEFAULT_DISTANCE_TO_SCREEN = 20.0;
public Camera()
{
objectToWorld = objectToView = worldToView = viewToWorld = Mat4.identity();
setDistToScreen(DEFAULT_DISTANCE_TO_SCREEN);
setScreenParams(0.0, 100.0, 100, 100);
}
public void setDistToScreen(double dist)
{
double oldScale = scale/distToScreen;
distToScreen = dist;
frontClipPlane = dist/20.0;
if (perspective)
setScreenParams(viewDist, oldScale, hres, vres);
else
setScreenParamsParallel(scale, hres, vres);
}
public double getDistToScreen()
{
return distToScreen;
}
public double getClipDistance()
{
return frontClipPlane;
}
public void setClipDistance(double distance)
{
frontClipPlane = distance;
}
/** Determine whether the camera is in perspective or parallel projection mode. */
public boolean isPerspective()
{
return perspective;
}
/** Create a duplicate of this camera. */
public Camera duplicate()
{
Camera c = null;
try
{
c = (Camera) clone();
}
catch (CloneNotSupportedException ex)
{
}
c.cameraCoords = cameraCoords.duplicate();
return c;
}
/** Set the camera to perspective mode with the specified parameters. */
public void setScreenParams(double newViewDist, double newScale, int newHres, int newVres)
{
viewDist = newViewDist;
scale = newScale*distToScreen;
hres = newHres;
vres = newVres;
perspective = true;
viewToScreen = Mat4.perspective(viewDist);
viewToScreen = Mat4.scale(-scale, -scale, scale).times(viewToScreen);
viewToScreen = Mat4.translation((double) hres/2.0, (double) vres/2.0, 0.0).times(viewToScreen);
worldToScreen = viewToScreen.times(worldToView);
objectToScreen = worldToScreen.times(objectToWorld);
}
/** Set the camera to parallel projection mode with the specified parameters. */
public void setScreenParamsParallel(double newScale, int newHres, int newVres)
{
scale = newScale;
hres = newHres;
vres = newVres;
perspective = false;
viewToScreen = Mat4.scale(-scale, -scale, scale);
viewToScreen = Mat4.translation((double) 0.5*hres, (double) 0.5*vres, 0.0).times(viewToScreen);
worldToScreen = viewToScreen.times(worldToView);
objectToScreen = worldToScreen.times(objectToWorld);
}
/** Set the dimension's of the camera's viewport. */
public void setSize(int newHres, int newVres)
{
hres = newHres;
vres = newVres;
if (perspective)
viewToScreen = Mat4.perspective(viewDist);
else
viewToScreen = Mat4.identity();
viewToScreen = Mat4.scale(-scale, -scale, scale).times(viewToScreen);
viewToScreen = Mat4.translation((double) hres/2.0, (double) vres/2.0, 0.0).times(viewToScreen);
worldToScreen = viewToScreen.times(worldToView);
objectToScreen = worldToScreen.times(objectToWorld);
}
/** Get the dimension's of the camera's viewport. */
public Dimension getSize()
{
return new Dimension(hres, vres);
}
/** Get the camera's scale factor. */
public double getScale()
{
return scale;
}
/** Set the grid spacing. */
public void setGrid(double spacing)
{
gridSpacing = spacing;
}
/** Set the camera's coordinate system. */
public void setCameraCoordinates(CoordinateSystem coords)
{
worldToView = coords.toLocal();
viewToWorld = coords.fromLocal();
objectToView = worldToView.times(objectToWorld);
worldToScreen = viewToScreen.times(worldToView);
objectToScreen = worldToScreen.times(objectToWorld);
cameraCoords = coords;
}
/** Explicitly set the transformation between world and view coordinates. */
public void setViewTransform(Mat4 worldToView, Mat4 viewToWorld)
{
this.worldToView = worldToView;
this.viewToWorld = viewToWorld;
objectToView = worldToView.times(objectToWorld);
worldToScreen = viewToScreen.times(worldToView);
objectToScreen = worldToScreen.times(objectToWorld);
}
/** Get the camera's coordinate system. */
public CoordinateSystem getCameraCoordinates()
{
return cameraCoords;
}
/** Set the transformation for converting object coordinates to world coordinates. */
public void setObjectTransform(Mat4 m)
{
objectToWorld = m;
objectToView = worldToView.times(objectToWorld);
objectToScreen = worldToScreen.times(objectToWorld);
}
/** The following routines return the various transformation matrices maintained by
the Camera object. */
public final Mat4 getObjectToWorld()
{
return objectToWorld;
}
public final Mat4 getObjectToView()
{
return objectToView;
}
public final Mat4 getObjectToScreen()
{
return objectToScreen;
}
public final Mat4 getWorldToView()
{
return worldToView;
}
public final Mat4 getWorldToScreen()
{
return worldToScreen;
}
public final Mat4 getViewToScreen()
{
return viewToScreen;
}
public final Mat4 getViewToWorld()
{
return viewToWorld;
}
/** Given a point in screen coordinates, find the corresponding point in world coordinates
which is at a specified depth from the viewpoint. If the grid is turned on, the
oisuruib us adjusted based on it. */
public Vec3 convertScreenToWorld(Point p, double depth)
{
return convertScreenToWorld(new Vec2(p.x, p.y), depth, true);
}
/** Given a point in screen coordinates, find the corresponding point in world coordinates
which is at a specified depth from the viewpoint. The optional parameter snapToGrid
specifies whether the position should be adjusted based on the current grid (if the
grid is turned on). */
public Vec3 convertScreenToWorld(Point p, double depth, boolean snapToGrid)
{
return convertScreenToWorld(new Vec2(p.x, p.y), depth, snapToGrid);
}
/** Given a point in screen coordinates, find the corresponding point in world coordinates
which is at a specified depth from the viewpoint. The optional parameter snapToGrid
specifies whether the position should be adjusted based on the current grid (if the
grid is turned on). */
public Vec3 convertScreenToWorld(Vec2 p, double depth, boolean snapToGrid)
{
Vec2 v1, v2;
Vec3 v3;
// Construct two points in view coordinates at the specified depth, and convert them
// to screen coordinates.
v1 = viewToScreen.timesXY(new Vec3(0.0, 0.0, depth));
v2 = viewToScreen.timesXY(new Vec3(1.0, 1.0, depth));
// Now solve for the specified point in view coordinates, and convert it to world
// coordinates.
v3 = new Vec3((p.x-v1.x)/(v2.x-v1.x), (p.y-v1.y)/(v2.y-v1.y), depth);
if (snapToGrid && gridSpacing > 0.0)
{
v3.x = Math.floor(v3.x/gridSpacing + 0.5) * gridSpacing;
v3.y = Math.floor(v3.y/gridSpacing + 0.5) * gridSpacing;
}
return viewToWorld.times(v3);
}
/** This is provided for backward compatibility. The version that takes doubles as
arguments is preferred. */
public Vec3 findDragVector(Vec3 p, int dx, int dy)
{
return findDragVector(p, (double) dx, (double) dy);
}
/** The following routine is used for dragging objects on the screen. Given a point p
(specified in world coordinates) which has been dragged by (dx, dy) pixels, find the
displacement vector in world coordinates. */
public Vec3 findDragVector(Vec3 p, double dx, double dy)
{
Vec3 v1, v2;
Vec2 v3, v4, p1;
double a, b;
// All motion should be parallel to the x and y axes of view coordinates, so find out
// what these are in world coordinates.
v1 = viewToWorld.timesDirection(Vec3.vx());
v2 = viewToWorld.timesDirection(Vec3.vy());
// Now find what they are in screen coordinates.
p1 = worldToScreen.timesXY(p);
v3 = (worldToScreen.timesXY(p.plus(v1))).minus(p1);
v4 = (worldToScreen.timesXY(p.plus(v2))).minus(p1);
// Now solve the equations.
b = (v3.x*dy-v3.y*dx)/(v3.x*v4.y-v4.x*v3.y);
a = (dx-b*v4.x)/v3.x;
if (gridSpacing > 0.0)
{
a = Math.floor(a/gridSpacing + 0.5) * gridSpacing;
b = Math.floor(b/gridSpacing + 0.5) * gridSpacing;
}
return (v1.times(a)).plus(v2.times(b));
}
/** Given a bounding box (specified in object coordinates), return a rectangle which
describes the object's position on the screen. If the object is not visible,
return null. */
public Rectangle findScreenBounds(BoundingBox bb)
{
Vec3 corner[] = bb.getCorners();
Vec2 p;
int i;
double minx = hres, miny = vres, maxx = -1.0, maxy = -1.0;
boolean clipped = true;
double z;
for (i = 0; i < 8; i++)
{
p = objectToScreen.timesXY(corner[i]);
z = objectToView.timesZ(corner[i]);
if (!perspective || z > frontClipPlane)
{
clipped = false;
if (p.x < minx) minx = p.x;
if (p.x > maxx) maxx = p.x;
if (p.y < miny) miny = p.y;
if (p.y > maxy) maxy = p.y;
}
else
{
if (p.x < hres/2.0) maxx = hres;
else
minx = -1.0;
if (p.y < vres/2.0) maxy = vres;
else
miny = -1.0;
}
}
if (clipped || minx == hres || miny == vres || maxx == -1.0 || maxy == -1.0)
return null;
return new Rectangle((int) minx, (int) miny, (int) (Math.ceil(maxx)-minx), (int) (Math.ceil(maxy)-miny));
}
public static final int NOT_VISIBLE = 0;
public static final int NEEDS_CLIPPING = 1;
public static final int VISIBLE = 2;
/** Given a bounding box (specified in object coordinates), determine whether the object is
visible. It returns one of the following values:
<ul>
<li>NOT_VISIBLE: The entire bounding box is offscreen. The object does not need to be drawn.</li>
<li>NEEDS_CLIPPING: The object is partly visible, but at least one corner of the box lies
in front of the clipping plane. It should be drawn using the clipping drawing routines.</li>
<li>VISIBLE: The object is entirely in front of the viewer, and can be drawn with the
faster (non-clipping) drawing routines.</li>
</ul>
*/
public int visibility(BoundingBox bb)
{
Vec3 corner[] = bb.getCorners();
Vec2 p;
boolean offLeft = true, offRight = true, offTop = true, offBottom = true;
int i, clippedCount = 0;
for (i = 0; i < 8; i++)
if (perspective && objectToView.timesZ(corner[i]) <= frontClipPlane)
clippedCount++;
if (clippedCount == 8)
return NOT_VISIBLE;
for (i = 0; i < 8; i++)
{
p = objectToScreen.timesXY(corner[i]);
if (p.x > 0.0) offLeft = false;
if (p.y > 0.0) offTop = false;
if (p.x < hres) offRight = false;
if (p.y < vres) offBottom = false;
if (!(offLeft | offTop | offRight | offBottom))
{
if (clippedCount == 0)
return VISIBLE;
else
return NEEDS_CLIPPING;
}
}
return NOT_VISIBLE;
}
/** Draw a line between two points (specified in object coordinates). */
public void drawLine(Graphics g, Vec3 from, Vec3 to)
{
double w;
int x, y;
final Mat4 m = objectToScreen;
w = m.m41*to.x + m.m42*to.y + m.m43*to.z + m.m44;
lastX = (int) ((m.m11*to.x + m.m12*to.y + m.m13*to.z + m.m14)/w);
lastY = (int) ((m.m21*to.x + m.m22*to.y + m.m23*to.z + m.m24)/w);
w = m.m41*from.x + m.m42*from.y + m.m43*from.z + m.m44;
x = (int) ((m.m11*from.x + m.m12*from.y + m.m13*from.z + m.m14)/w);
y = (int) ((m.m21*from.x + m.m22*from.y + m.m23*from.z + m.m24)/w);
g.drawLine(x, y, lastX, lastY);
}
/** Same as above, except clip the line to the front clipping plane. */
public void drawClippedLine(Graphics g, Vec3 from, Vec3 to)
{
Vec3 p1, p2;
Vec2 p3, p4;
double fract;
p1 = objectToView.times(from);
p2 = objectToView.times(to);
lastPoint = p2;
if (perspective)
{
if (p1.z <= frontClipPlane && p2.z <= frontClipPlane)
return;
if (p1.z < frontClipPlane)
{
fract = (frontClipPlane-p1.z)/(p2.z-p1.z);
p1 = p1.times(1.0-fract).plus(p2.times(fract));
}
else if (p2.z < frontClipPlane)
{
fract = (frontClipPlane-p2.z)/(p1.z-p2.z);
p2 = p2.times(1.0-fract).plus(p1.times(fract));
}
}
p3 = viewToScreen.timesXY(p1);
p4 = viewToScreen.timesXY(p2);
g.drawLine((int) p3.x, (int) p3.y, (int) p4.x, (int) p4.y);
}
/** Draw a line from the endpoint of the previous line to a new point. */
public void drawLineTo(Graphics g, Vec3 to)
{
double w;
int x, y;
final Mat4 m = objectToScreen;
w = m.m41*to.x + m.m42*to.y + m.m43*to.z + m.m44;
x = (int) ((m.m11*to.x + m.m12*to.y + m.m13*to.z + m.m14)/w);
y = (int) ((m.m21*to.x + m.m22*to.y + m.m23*to.z + m.m24)/w);
g.drawLine(lastX, lastY, x, y);
lastX = x;
lastY = y;
}
/** Same as above, except clip the line to the front clipping plane. */
public void drawClippedLineTo(Graphics g, Vec3 to)
{
Vec3 p1, p2;
Vec2 p3, p4;
double fract;
p1 = lastPoint;
p2 = objectToView.times(to);
lastPoint = p2;
if (perspective)
{
if (p1.z <= frontClipPlane && p2.z <= frontClipPlane)
return;
if (p1.z < frontClipPlane)
{
fract = (frontClipPlane-p1.z)/(p2.z-p1.z);
p1 = p1.times(1.0-fract).plus(p2.times(fract));
}
else if (p2.z < frontClipPlane)
{
fract = (frontClipPlane-p2.z)/(p1.z-p2.z);
p2 = p2.times(1.0-fract).plus(p1.times(fract));
}
}
p3 = viewToScreen.timesXY(p1);
p4 = viewToScreen.timesXY(p2);
g.drawLine((int) p3.x, (int) p3.y, (int) p4.x, (int) p4.y);
}
/** Draw a bounding box (specified in object coordinates). */
public void drawBox(Graphics g, BoundingBox bb)
{
Vec3 corner[] = bb.getCorners();
Vec2 v;
int i, x[] = new int [8], y[] = new int [8];
for (i = 0; i < 8; i++)
{
v = objectToScreen.timesXY(corner[i]);
x[i] = (int) v.x;
y[i] = (int) v.y;
}
g.drawLine(x[0], y[0], x[1], y[1]);
g.drawLine(x[1], y[1], x[3], y[3]);
g.drawLine(x[3], y[3], x[2], y[2]);
g.drawLine(x[2], y[2], x[0], y[0]);
g.drawLine(x[4], y[4], x[5], y[5]);
g.drawLine(x[5], y[5], x[7], y[7]);
g.drawLine(x[7], y[7], x[6], y[6]);
g.drawLine(x[6], y[6], x[4], y[4]);
g.drawLine(x[0], y[0], x[4], y[4]);
g.drawLine(x[1], y[1], x[5], y[5]);
g.drawLine(x[2], y[2], x[6], y[6]);
g.drawLine(x[3], y[3], x[7], y[7]);
}
/** Same as above, except clip all the edges of the box to the front clipping plane. */
public void drawClippedBox(Graphics g, BoundingBox bb)
{
Vec3 corner[] = bb.getCorners();
drawClippedLine(g, corner[0], corner[1]);
drawClippedLineTo(g, corner[3]);
drawClippedLineTo(g, corner[2]);
drawClippedLineTo(g, corner[0]);
drawClippedLineTo(g, corner[4]);
drawClippedLineTo(g, corner[5]);
drawClippedLineTo(g, corner[7]);
drawClippedLineTo(g, corner[6]);
drawClippedLineTo(g, corner[4]);
drawClippedLine(g, corner[1], corner[5]);
drawClippedLine(g, corner[2], corner[6]);
drawClippedLine(g, corner[3], corner[7]);
}
/** Draw a cubic Bezier curve, using the four specified control vertices. We do this by
forward differencing. For speed, we always subdivide the curve into eight segments.
This should be enough for interactive purposes, and allows the forward differencing
coefficients to be precalculated. */
public void drawBezier(Graphics g, Vec3 v1, Vec3 v2, Vec3 v3, Vec3 v4)
{
double x1, x2, x3, x4, y1, y2, y3, y4, w1, w2, w3, w4;
double dx1, dx2, dx3;
double dy1, dy2, dy3;
double dw1, dw2, dw3;
int i, h, v, oldh, oldv;
Mat4 m = objectToScreen;
x1 = m.m11*v1.x+m.m12*v1.y+m.m13*v1.z+m.m14;
x2 = m.m11*v2.x+m.m12*v2.y+m.m13*v2.z+m.m14;
x3 = m.m11*v3.x+m.m12*v3.y+m.m13*v3.z+m.m14;
x4 = m.m11*v4.x+m.m12*v4.y+m.m13*v4.z+m.m14;
y1 = m.m21*v1.x+m.m22*v1.y+m.m23*v1.z+m.m24;
y2 = m.m21*v2.x+m.m22*v2.y+m.m23*v2.z+m.m24;
y3 = m.m21*v3.x+m.m22*v3.y+m.m23*v3.z+m.m24;
y4 = m.m21*v4.x+m.m22*v4.y+m.m23*v4.z+m.m24;
w1 = m.m41*v1.x+m.m42*v1.y+m.m43*v1.z+m.m44;
w2 = m.m41*v2.x+m.m42*v2.y+m.m43*v2.z+m.m44;
w3 = m.m41*v3.x+m.m42*v3.y+m.m43*v3.z+m.m44;
w4 = m.m41*v4.x+m.m42*v4.y+m.m43*v4.z+m.m44;
dx1 = -0.330078125*x1 + 0.287109375*x2 + 0.041015625*x3 + 0.001953125*x4;
dx2 = 0.08203125*x1 - 0.15234375*x2 + 0.05859375*x3 + 0.01171875*x4;
dx3 = 0.01171875*(x4-x1) + 0.03515625*(x2-x3);
dy1 = -0.330078125*y1 + 0.287109375*y2 + 0.041015625*y3 + 0.001953125*y4;
dy2 = 0.08203125*y1 - 0.15234375*y2 + 0.05859375*y3 + 0.01171875*y4;
dy3 = 0.01171875*(y4-y1) + 0.03515625*(y2-y3);
dw1 = -0.330078125*w1 + 0.287109375*w2 + 0.041015625*w3 + 0.001953125*w4;
dw2 = 0.08203125*w1 - 0.15234375*w2 + 0.05859375*w3 + 0.01171875*w4;
dw3 = 0.01171875*(w4-w1) + 0.03515625*(w2-w3);
oldh = (int) (x1/w1);
oldv = (int) (y1/w1);
for (i = 0; i < 8; i++)
{
x1 += dx1; dx1 += dx2; dx2 += dx3;
y1 += dy1; dy1 += dy2; dy2 += dy3;
w1 += dw1; dw1 += dw2; dw2 += dw3;
h = (int) (x1/w1);
v = (int) (y1/w1);
g.drawLine(oldh, oldv, h, v);
oldh = h;
oldv = v;
}
}
/** Same as above, except clip the curve to the front clipping plane. */
public void drawClippedBezier(Graphics g, Vec3 v1, Vec3 v2, Vec3 v3, Vec3 v4)
{
Vec3 pos;
double dx1, dx2, dx3;
double dy1, dy2, dy3;
double dz1, dz2, dz3;
boolean clip1, clip2, clip3, clip4;
int i;
clip1 = (perspective && objectToView.timesZ(v1) < frontClipPlane);
clip2 = (perspective && objectToView.timesZ(v2) < frontClipPlane);
clip3 = (perspective && objectToView.timesZ(v3) < frontClipPlane);
clip4 = (perspective && objectToView.timesZ(v4) < frontClipPlane);
if (clip1 && clip2 && clip3 && clip4)
return;
if (!(clip1 || clip2 || clip3 || clip4))
drawBezier(g, v1, v2, v3, v4);
dx1 = -0.330078125*v1.x + 0.287109375*v2.x + 0.041015625*v3.x + 0.001953125*v4.x;
dx2 = 0.08203125*v1.x - 0.15234375*v2.x + 0.05859375*v3.x + 0.01171875*v4.x;
dx3 = 0.01171875*(v4.x-v1.x) + 0.03515625*(v2.x-v3.x);
dy1 = -0.330078125*v1.y + 0.287109375*v2.y + 0.041015625*v3.y + 0.001953125*v4.y;
dy2 = 0.08203125*v1.y - 0.15234375*v2.y + 0.05859375*v3.y + 0.01171875*v4.y;
dy3 = 0.01171875*(v4.y-v1.y) + 0.03515625*(v2.y-v3.y);
dz1 = -0.330078125*v1.z + 0.287109375*v2.z + 0.041015625*v3.z + 0.001953125*v4.z;
dz2 = 0.08203125*v1.z - 0.15234375*v2.z + 0.05859375*v3.z + 0.01171875*v4.z;
dz3 = 0.01171875*(v4.z-v1.z) + 0.03515625*(v2.z-v3.z);
pos = new Vec3(v1.x+dx1, v1.y+dy1, v1.z+dz1);
dx1 += dx2; dx2 += dx3;
dy1 += dy2; dy2 += dy3;
dz1 += dz2; dz2 += dz3;
drawClippedLine(g, v1, pos);
for (i = 0; i < 7; i++)
{
pos.x += dx1; dx1 += dx2; dx2 += dx3;
pos.y += dy1; dy1 += dy2; dy2 += dy3;
pos.z += dz1; dz1 += dz2; dz2 += dz3;
drawClippedLineTo(g, pos);
}
}
/** Draw a cubic Bezier curve, using the four specified control vertices. We do this by
recursive subdivision. We always subdivide three times, which should be enough for
interactive purposes. For speed, fixed point arithmetic is used throughout. */
public void drawBezier2(Graphics g, Vec3 v1, Vec3 v2, Vec3 v3, Vec3 v4)
{
int x1, x2, x3, x4, y1, y2, y3, y4, w1, w2, w3, w4;
Mat4 m = objectToScreen;
x1 = (int) ((m.m11*v1.x+m.m12*v1.y+m.m13*v1.z+m.m14)*65536.0);
x2 = (int) ((m.m11*v2.x+m.m12*v2.y+m.m13*v2.z+m.m14)*65536.0);
x3 = (int) ((m.m11*v3.x+m.m12*v3.y+m.m13*v3.z+m.m14)*65536.0);
x4 = (int) ((m.m11*v4.x+m.m12*v4.y+m.m13*v4.z+m.m14)*65536.0);
y1 = (int) ((m.m21*v1.x+m.m22*v1.y+m.m23*v1.z+m.m24)*65536.0);
y2 = (int) ((m.m21*v2.x+m.m22*v2.y+m.m23*v2.z+m.m24)*65536.0);
y3 = (int) ((m.m21*v3.x+m.m22*v3.y+m.m23*v3.z+m.m24)*65536.0);
y4 = (int) ((m.m21*v4.x+m.m22*v4.y+m.m23*v4.z+m.m24)*65536.0);
w1 = (int) ((m.m41*v1.x+m.m42*v1.y+m.m43*v1.z+m.m44)*65536.0);
w2 = (int) ((m.m41*v2.x+m.m42*v2.y+m.m43*v2.z+m.m44)*65536.0);
w3 = (int) ((m.m41*v3.x+m.m42*v3.y+m.m43*v3.z+m.m44)*65536.0);
w4 = (int) ((m.m41*v4.x+m.m42*v4.y+m.m43*v4.z+m.m44)*65536.0);
divideAndDraw(g, x1, x2, x3, x4, y1, y2, y3, y4, w1, w2, w3, w4, 3);
}
void divideAndDraw(Graphics g, int x1, int x2, int x3, int x4, int y1, int y2, int y3, int y4, int w1, int w2, int w3, int w4, int count)
{
int xl2, xl3, xl4, xr2, xr3, xh;
int yl2, yl3, yl4, yr2, yr3, yh;
int wl2, wl3, wl4, wr2, wr3, wh;
// Subdivide the curve.
xl2 = (x1+x2)>>1;
xh = (x2+x3)>>1;
xl3 = (xl2+xh)>>1;
xr3 = (x3+x4)>>1;
xr2 = (xh+xr3)>>1;
xl4 = (xl3+xr2)>>1;
yl2 = (y1+y2)>>1;
yh = (y2+y3)>>1;
yl3 = (yl2+yh)>>1;
yr3 = (y3+y4)>>1;
yr2 = (yh+yr3)>>1;
yl4 = (yl3+yr2)>>1;
wl2 = (w1+w2)>>1;
wh = (w2+w3)>>1;
wl3 = (wl2+wh)>>1;
wr3 = (w3+w4)>>1;
wr2 = (wh+wr3)>>1;
wl4 = (wl3+wr2)>>1;
// If we've subdivided enough, draw the curve and return. Otherwise, subdivide again.
if (count == 1)
{
g.drawLine(x1/w1, y1/w1, xl4/wl4, yl4/wl4);
g.drawLine(x4/w4, y4/w4, xl4/wl4, yl4/wl4);
return;
}
else
{
divideAndDraw(g, x1, xl2, xl3, xl4, y1, yl2, yl3, yl4, w1, wl2, wl3, wl4, count-1);
divideAndDraw(g, xl4, xr2, xr3, x4, yl4, yr2, yr3, y4, wl4, wr2, wr3, w4, count-1);
}
}
}
The table below shows all metrics for Camera.java.
| Metric | Value | Description | |
|---|---|---|---|
| BLOCKS | 61.00 | Number of blocks | |
| BLOCK_COMMENT | 9.00 | Number of block comment lines | |
| COMMENTS | 93.00 | Comment lines | |
| COMMENT_DENSITY | 0.23 | Comment density | |
| COMPARISONS | 45.00 | Number of comparison operators | |
| CYCLOMATIC | 94.00 | Cyclomatic complexity | |
| DECL_COMMENTS | 31.00 | Comments in declarations | |
| DOC_COMMENT | 74.00 | Number of javadoc comment lines | |
| ELOC | 404.00 | Effective lines of code | |
| EXEC_COMMENTS | 7.00 | Comments in executable code | |
| EXITS | 31.00 | Procedure exits | |
| FUNCTIONS | 41.00 | Number of function declarations | |
| HALSTEAD_DIFFICULTY | 151.41 | Halstead difficulty | |
| HALSTEAD_EFFORT | 0.00 | Halstead effort | |
| INTERFACE_COMPLEXITY | 124.00 | Interface complexity | |
| JAVA0001 | 0.00 | JAVA0001 Package name does not contain only lower case letters | |
| JAVA0002 | 1.00 | JAVA0002 Package name does not begin with a top level domain name or country code | |
| JAVA0003 | 1.00 | JAVA0003 Minimize use of on-demand (.*) imports | |
| JAVA0004 | 0.00 | JAVA0004 Unnecessary import from java.lang | |
| JAVA0005 | 1.00 | JAVA0005 Imports not in specified order | |
| JAVA0006 | 0.00 | JAVA0006 Empty finally block | |
| JAVA0007 | 0.00 | JAVA0007 Should not declare public field | |
| JAVA0008 | 1.00 | JAVA0008 Empty catch block | |
| JAVA0009 | 0.00 | JAVA0009 Protected member in final class | |
| JAVA0010 | 0.00 | JAVA0010 Non-instantiable class does not contain a non-private static member | |
| JAVA0011 | 0.00 | JAVA0011 Abstract class does not contain an abstract method | |
| JAVA0012 | 0.00 | JAVA0012 Non-constructor method with same name as declaring class | |
| JAVA0013 | 0.00 | JAVA0013 Non-blank final field is not static | |
| JAVA0014 | 0.00 | JAVA0014 Class with only static members has non-private constructor | |
| JAVA0015 | 0.00 | JAVA0015 Package class contains public nested type | |
| JAVA0016 | 0.00 | JAVA0016 Abstract class contains public constructor | |
| JAVA0017 | 0.00 | JAVA0017 Class name does not have required form | |
| JAVA0018 | 0.00 | JAVA0018 Method name does not have required form | |
| JAVA0019 | 0.00 | JAVA0019 Interface name does not have required form | |
| JAVA0020 | 0.00 | JAVA0020 Field name does not have required form | |
| JAVA0021 | 0.00 | JAVA0021 Interface method name does not have required form | |
| JAVA0022 | 0.00 | JAVA0022 Static final field name does not have required form | |
| JAVA0023 | 0.00 | JAVA0023 Empty finalize method | |
| JAVA0024 | 0.00 | JAVA0024 Empty class | |
| JAVA0025 | 0.00 | JAVA0025 Method override is empty | |
| JAVA0026 | 0.00 | JAVA0026 Finalize method with parameters | |
| JAVA0029 | 0.00 | JAVA0029 Private method not used | |
| JAVA0030 | 0.00 | JAVA0030 Private field not used | |
| JAVA0031 | 0.00 | JAVA0031 Case statement not properly closed | |
| JAVA0032 | 0.00 | JAVA0032 Switch statement missing default | |
| JAVA0033 | 0.00 | JAVA0033 default: not last case in switch statement | |
| JAVA0034 | 25.00 | JAVA0034 Missing braces in if statement | |
| JAVA0035 | 1.00 | JAVA0035 Missing braces in for statement | |
| JAVA0036 | 0.00 | JAVA0036 Missing braces in while statement | |
| JAVA0038 | 0.00 | JAVA0038 Non-case label in switch statement | |
| JAVA0039 | 0.00 | JAVA0039 Break statement with label | |
| JAVA0040 | 0.00 | JAVA0040 Switch statement contains N cases (maximum: M) | |
| JAVA0041 | 0.00 | JAVA0041 Nested synchronized block | |
| JAVA0042 | 0.00 | JAVA0042 Empty synchronized statement | |
| JAVA0043 | 0.00 | JAVA0043 Inner class does not use outer class | |
| JAVA0044 | 0.00 | JAVA0044 Serializable class with no instance variables | |
| JAVA0045 | 0.00 | JAVA0045 Serializable class with only transient fields | |
| JAVA0046 | 0.00 | JAVA0046 Name of class not derived from Exception ends with 'Exception' | |
| JAVA0047 | 0.00 | JAVA0047 Serializable class derives from invalid base class | |
| JAVA0048 | 0.00 | JAVA0048 Name of class derived from Exception does not end with 'Exception' | |
| JAVA0049 | 0.00 | JAVA0049 Nested block at depth N (maximum: M) | |
| JAVA0050 | 0.00 | JAVA0050 Class derives from java.lang.Error | |
| JAVA0051 | 0.00 | JAVA0051 Class derives from java.lang.RuntimeException | |
| JAVA0052 | 0.00 | JAVA0052 Class derives from java.lang.Throwable | |
| JAVA0053 | 0.00 | JAVA0053 Unused label | |
| JAVA0054 | 0.00 | JAVA0054 Inheritance depth N exceeds maximum M | |
| JAVA0055 | 0.00 | JAVA0055 Class should be interface | |
| JAVA0056 | 0.00 | JAVA0056 Unnecessary abstract modifier for interface or annotation | |
| JAVA0057 | 0.00 | JAVA0057 Unnecessary default constructor | |
| JAVA0058 | 0.00 | JAVA0058 Constructor calls super() | |
| JAVA0059 | 0.00 | JAVA0059 Method override only calls super() | |
| JAVA0061 | 0.00 | JAVA0061 Inaccessible member in anonymous class | |
| JAVA0062 | 0.00 | JAVA0062 Public class missing public member or protected constructor | |
| JAVA0063 | 0.00 | JAVA0063 Identifier name should not contain '$' | |
| JAVA0064 | 0.00 | JAVA0064 N variations of identifier name (maximum: M) | |
| JAVA0065 | 0.00 | JAVA0065 Unnecessary final modifier for method in final class | |
| JAVA0066 | 0.00 | JAVA0066 Unnecessary modifier for interface nested type | |
| JAVA0067 | 6.00 | JAVA0067 Array descriptor on identifier name | |
| JAVA0068 | 0.00 | JAVA0068 Modifiers not declared in recommended order | |
| JAVA0071 | 0.00 | JAVA0071 Strings compared with == | |
| JAVA0073 | 0.00 | JAVA0073 Integer division in floating-point context | |
| JAVA0074 | 0.00 | JAVA0074 Use of Object.notify() | |
| JAVA0075 | 0.00 | JAVA0075 Method parameter hides field | |
| JAVA0076 | 106.00 | JAVA0076 Use of magic number | |
| JAVA0077 | 0.00 | JAVA0077 Private field not used in declaring class | |
| JAVA0078 | 4.00 | JAVA0078 Floating point values compared with == | |
| JAVA0079 | 0.00 | JAVA0079 Use of instance to reference static member | |
| JAVA0080 | 0.00 | JAVA0080 Import declaration not used | |
| JAVA0081 | 0.00 | JAVA0081 Boolean literal in comparison | |
| JAVA0082 | 2.00 | JAVA0082 Unnecessary widening cast | |
| JAVA0083 | 0.00 | JAVA0083 Unnecessary instanceof test | |
| JAVA0084 | 0.00 | JAVA0084 Should use compound assignment operator | |
| JAVA0085 | 0.00 | JAVA0085 Use of sun.* class | |
| JAVA0087 | 0.00 | JAVA0087 Use of Thread.sleep() | |
| JAVA0089 | 0.00 | JAVA0089 Use of restricted package | |
| JAVA0092 | 0.00 | JAVA0092 Use of restricted type | |
| JAVA0093 | 0.00 | JAVA0093 Redundant assignment | |
| JAVA0094 | 0.00 | JAVA0094 Field hides a superclass field | |
| JAVA0095 | 0.00 | JAVA0095 Uninitialized private field | |
| JAVA0096 | 0.00 | JAVA0096 Field in nested class hides outer field | |
| JAVA0098 | 0.00 | JAVA0098 Minimize use of implicit field initializers | |
| JAVA0100 | 0.00 | JAVA0100 Class contains N non-final fields (maximum: M) | |
| JAVA0101 | 0.00 | JAVA0101 Unnecessary modifier for field in interface | |
| JAVA0102 | 0.00 | JAVA0102 Last statement in finalize() not super.finalize() | |
| JAVA0103 | 0.00 | JAVA0103 Explicit call to finalize() | |
| JAVA0104 | 0.00 | JAVA0104 finalize() only calls super.finalize() | |
| JAVA0105 | 0.00 | JAVA0105 Duplicate import declaration | |
| JAVA0106 | 0.00 | JAVA0106 Unnecessary import from current package | |
| JAVA0108 | 59.00 | JAVA0108 Incorrect javadoc: no @param tag for 'parameter' | |
| JAVA0109 | 0.00 | JAVA0109 Incorrect javadoc: no parameter 'parameter' | |
| JAVA0110 | 13.00 | JAVA0110 Incorrect javadoc: no @return tag | |
| JAVA0111 | 0.00 | JAVA0111 Incorrect javadoc: @return tag for void method | |
| JAVA0112 | 0.00 | JAVA0112 Incorrect javadoc: no exception 'exception' in throws | |
| JAVA0113 | 1.00 | JAVA0113 Incorrect javadoc: no @author tag | |
| JAVA0114 | 1.00 | JAVA0114 Incorrect javadoc: no @version tag | |
| JAVA0115 | 0.00 | JAVA0115 Incorrect javadoc: no @throws or @exception tag for 'exception' | |
| JAVA0116 | 4.00 | JAVA0116 Missing javadoc: field 'field' | |
| JAVA0117 | 11.00 | JAVA0117 Missing javadoc: method 'method' | |
| JAVA0118 | 0.00 | JAVA0118 Missing javadoc: type 'type' | |
| JAVA0119 | 0.00 | JAVA0119 Control variable changed within body of for loop | |
| JAVA0123 | 0.00 | JAVA0123 Use all three components of for loop | |
| JAVA0125 | 0.00 | JAVA0125 Continue statement with label | |
| JAVA0126 | 0.00 | JAVA0126 Method declares unchecked exception in throws | |
| JAVA0128 | 0.00 | JAVA0128 Public constructor in non-public class | |
| JAVA0130 | 0.00 | JAVA0130 Non-static method does not use instance fields | |
| JAVA0131 | 0.00 | JAVA0131 Compatible method does not override base | |
| JAVA0132 | 0.00 | JAVA0132 Method overload with compatible signature | |
| JAVA0133 | 0.00 | JAVA0133 Non-synchronized method overrides synchronized method | |
| JAVA0135 | 0.00 | JAVA0135 Only one of Object.equals and Object.hashCode defined: missing 'method' | |
| JAVA0136 | 1.00 | JAVA0136 N methods defined in class (maximum: M) | |
| JAVA0137 | 0.00 | JAVA0137 Non-abstract class missing constructor | |
| JAVA0138 | 1.00 | JAVA0138 N parameters defined for method (maximum: M) | |
| JAVA0139 | 0.00 | JAVA0139 Definition of main other than public static void main(java.lang.String[]) | |
| JAVA0141 | 0.00 | JAVA0141 Unnecessary modifier for method in interface | |
| JAVA0143 | 0.00 | JAVA0143 Synchronized method | |
| JAVA0144 | 1.00 | JAVA0144 Line exceeds maximum M characters | |
| JAVA0145 | 0.00 | JAVA0145 Tab character used in source file | |
| JAVA0150 | 0.00 | JAVA0150 java.lang.Error (or subclass) thrown | |
| JAVA0153 | 0.00 | JAVA0153 Inefficient conversion of integer to string | |
| JAVA0159 | 0.00 | JAVA0159 Inefficient conversion of string to integer | |
| JAVA0160 | 0.00 | JAVA0160 Method does not throw specified exception | |
| JAVA0161 | 0.00 | JAVA0161 Conditional wait() not in loop | |
| JAVA0163 | 0.00 | JAVA0163 Empty statement | |
| JAVA0165 | 0.00 | JAVA0165 Conflicting return statement in finally block | |
| JAVA0166 | 0.00 | JAVA0166 Generic exception caught | |
| JAVA0167 | 0.00 | JAVA0167 ThreadDeath not rethrown | |
| JAVA0169 | 0.00 | JAVA0169 Unnecessary catch block: exception 'exception' | |
| JAVA0170 | 0.00 | JAVA0170 Caught exception not derived from java.lang.Exception | |
| JAVA0171 | 0.00 | JAVA0171 Unused local variable | |
| JAVA0173 | 0.00 | JAVA0173 Unused method parameter | |
| JAVA0174 | 0.00 | JAVA0174 Assigned local variable never used | |
| JAVA0175 | 0.00 | JAVA0175 Successive assignment to variable | |
| JAVA0176 | 0.00 | JAVA0176 Local variable name does not have required form | |
| JAVA0177 | 104.00 | JAVA0177 Variable declaration missing initializer | |
| JAVA0179 | 0.00 | JAVA0179 Local variable hides visible field | |
| JAVA0233 | 0.00 | JAVA0233 Definition of serialVersionUID other than 'private static final long serialVersionUID' | |
| JAVA0234 | 0.00 | JAVA0234 Class is Serializable but does not define serialVersionUID | |
| JAVA0235 | 0.00 | JAVA0235 Class defines serialVersionUID but does not implement Serializable | |
| JAVA0236 | 0.00 | JAVA0236 Attempt to clone an object which does not implement Cloneable | |
| JAVA0237 | 1.00 | JAVA0237 Class implements Cloneable but does not have public clone method | |
| JAVA0238 | 0.00 | JAVA0238 Clone method does not call super.clone() | |
| JAVA0239 | 0.00 | JAVA0239 Class declares 'readObject' or 'writeObject' but does not implement Serializable | |
| JAVA0240 | 0.00 | JAVA0240 Serializable class which declares readObject or writeObject but not both | |
| JAVA0241 | 0.00 | JAVA0241 'readObject' or 'writeObject' should be declared private in Serializable class | |
| JAVA0242 | 0.00 | JAVA0242 Transient field in non-Serializable class | |
| JAVA0243 | 0.00 | JAVA0243 'readResolve' or 'writeReplace' should be declared private or protected | |
| JAVA0244 | 0.00 | JAVA0244 Field or method name in subclass differs only by case from inherited field or method | |
| JAVA0245 | 0.00 | JAVA0245 JUnit TestCase with non-trivial constructor | |
| JAVA0246 | 0.00 | JAVA0246 JUnit assertXXX statement missing message parameter | |
| JAVA0247 | 0.00 | JAVA0247 JUnit 'setUp()' and 'tearDown()' should call super method | |
| JAVA0248 | 0.00 | JAVA0248 JUnit method 'setUp' or 'tearDown' with incorrect signature | |
| JAVA0249 | 0.00 | JAVA0249 JUnit TestCase 'suite()' should be declared static | |
| JAVA0250 | 0.00 | JAVA0250 JUnit TestCase declares testXXX method with incorrect signature | |
| JAVA0251 | 0.00 | JAVA0251 Use '%n' for line breaks in printf/format for platform independence | |
| JAVA0252 | 0.00 | JAVA0252 'enum' is a Java 1.5 reserved word | |
| JAVA0253 | 0.00 | JAVA0253 Not all enum constants consumed in switch statement | |
| JAVA0254 | 0.00 | JAVA0254 Use enhanced for loop construct instead of Iterator | |
| JAVA0255 | 0.00 | JAVA0255 Result of method invocation not used | |
| JAVA0256 | 0.00 | JAVA0256 Assignment of external collection/array to field | |
| JAVA0257 | 0.00 | JAVA0257 Use of 'Constant Interface' anti-pattern | |
| JAVA0258 | 0.00 | JAVA0258 Implement Iterable for foreach compatibility | |
| JAVA0259 | 0.00 | JAVA0259 Return of collection/array field | |
| JAVA0260 | 0.00 | JAVA0260 Use 'enum' instead of Enumerated Type pattern | |
| JAVA0261 | 0.00 | JAVA0261 Use specialized Enum collection types | |
| JAVA0262 | 0.00 | JAVA0262 Use of char in integer context | |
| JAVA0263 | 0.00 | JAVA0263 Long literal ends with 'l' instead of 'L' | |
| JAVA0264 | 0.00 | JAVA0264 Integer math in long context - check for overflow | |
| JAVA0265 | 0.00 | JAVA0265 Use of Throwable.printStackTrace() | |
| JAVA0266 | 0.00 | JAVA0266 Use of System.out | |
| JAVA0267 | 0.00 | JAVA0267 Use of System.err | |
| JAVA0269 | 0.00 | JAVA0269 Contents of StringBuffer never used | |
| JAVA0270 | 0.00 | JAVA0270 Use Java 5.0 enhanced for loop construct to iterate over all elements in an array | |
| JAVA0271 | 0.00 | JAVA0271 Minimize use of on-demand (.*) static imports | |
| JAVA0272 | 0.00 | JAVA0272 Thread.run() called | |
| JAVA0273 | 0.00 | JAVA0273 Non-final derivative of Thread calls start() in constructor | |
| JAVA0274 | 0.00 | JAVA0274 Serializable class has a synchronized readObject() | |
| JAVA0275 | 0.00 | JAVA0275 Serializable class has a synchronized writeObject() and no other synchronized methods | |
| JAVA0276 | 0.00 | JAVA0276 Unnecessary use of String constructor | |
| JAVA0277 | 0.00 | JAVA0277 Iterator.next() implementation does not throw NoSuchElementException | |
| JAVA0278 | 0.00 | JAVA0278 Unnecessary use of Boolean constructor | |
| JAVA0279 | 0.00 | JAVA0279 Serialization method readObject or readObjectNoData calls an overridable method | |
| JAVA0280 | 0.00 | JAVA0280 IllegalMonitorStateException caught | |
| JAVA0281 | 0.00 | JAVA0281 Iterator.next() not called in loop | |
| JAVA0282 | 0.00 | JAVA0282 Call to Iterator.next() in loop which does not test Iterator.hasNext() | |
| JAVA0283 | 0.00 | JAVA0283 Control variable not updated in loop body | |
| JAVA0284 | 0.00 | JAVA0284 Explicit garbage collection | |
| JAVA0285 | 1.00 | JAVA0285 Dereference of potentially null variable | |
| JAVA0286 | 0.00 | JAVA0286 Dereference of null variable | |
| JAVA0287 | 0.00 | JAVA0287 Unnecessary null check | |
| JAVA0288 | 0.00 | JAVA0288 Inconsistent null check | |
| LINES | 722.00 | Number of lines in the source file | |
| LINE_COMMENT | 10.00 | Number of line comments | |
| LOC | 527.00 | Lines of code | |
| LOGICAL_LINES | 352.00 | Number of statements | |
| LOOPS | 6.00 | Number of loops | |
| NEST_DEPTH | 3.00 | Maximum nesting depth | |
| OPERANDS | 2208.00 | Number of operands | |
| OPERATORS | 3193.00 | Number of operators | |
| PARAMS | 75.00 | Number of formal parameter declarations | |
| PROGRAM_LENGTH | 5401.00 | Halstead program length | |
| PROGRAM_VOCAB | 398.00 | Halstead program vocabulary | |
| PROGRAM_VOLUME | 0.00 | Halstead program volume | |
| RETURNS | 49.00 | Number of return points from functions | |
| SIZE | 24076.00 | Size of the file in bytes | |
| UNIQUE_OPERANDS | 350.00 | Number of unique operands | |
| UNIQUE_OPERATORS | 48.00 | Number of unique operators | |
| WHITESPACE | 102.00 | Number of whitespace lines | |