public static void main(String[] args) {
Canvas canvas = new Canvas();
canvas.setTitle("canvas sample");
canvas.setSize(600, 200);
canvas.setLocationRelativeTo(null);
canvas.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
CanvasData dd = new CanvasData(300);
NewPanel p = new NewPanel(dd);
canvas.add(p);
canvas.setVisible(true);
}
private Image loadImage(
Image img, double x, double y, double width, double height, double alpha, boolean draw) {
if (width != 0) img.setWidth(width);
if (height != 0) img.setHeight(height);
switch (imageMode) {
case CORNER:
double w = img.getWidth();
double h = img.getHeight();
img.setX(x + w / 2);
img.setY(y + h / 2);
break;
case CENTER:
img.setX(x);
img.setY(y);
}
// todo: differentiate between newly constructed objects and copies.
img.setTransformDelegate(new ContextTransformDelegate(this));
inheritFromContext(img);
if (alpha != 1.0) img.setAlpha(alpha);
if (draw) canvas.add(img);
return img;
}
private static boolean testCanvas() {
boolean pass = true;
int test = 1;
double area;
Canvas canvas = new Canvas();
Circle[] circles = new Circle[3];
Rectangle[] rects = new Rectangle[3];
Triangle[] tris = new Triangle[3];
ConvexPolygon[] polys = new ConvexPolygon[3];
ArrayList<Circle> circleList;
ArrayList<Rectangle> rectList;
ArrayList<Triangle> triList;
ArrayList<ConvexPolygon> polyList;
ArrayList<Shape> shapeList;
circles[0] = new Circle(1.1, new Point(1, 2), Color.cyan, false);
circles[1] = new Circle(2.2, new Point(2, 3), Color.red, false);
circles[2] = new Circle(3.3, new Point(3, 4), Color.black, false);
rects[0] = new Rectangle(1.1, 1.11, new Point(1, 2), Color.cyan, false);
rects[1] = new Rectangle(2.2, 2.22, new Point(2, 3), Color.red, false);
rects[2] = new Rectangle(3.3, 3.33, new Point(3, 4), Color.black, false);
Point a = new Point(1, 1);
Point b = new Point(0, 2);
Point c = new Point(0, 0);
Point aa = new Point(2, 2);
Point bb = new Point(1, 3);
Point cc = new Point(1, 1);
Point aaa = new Point(3, 3);
Point bbb = new Point(2, 4);
Point ccc = new Point(2, 2);
tris[0] = new Triangle(a, b, c, Color.cyan, false);
tris[1] = new Triangle(aa, bb, cc, Color.red, false);
tris[2] = new Triangle(aaa, bbb, ccc, Color.black, false);
Point[] aVertices = new Point[5];
Point[] bVertices = new Point[5];
Point[] cVertices = new Point[5];
aVertices[0] = new Point(4, 0);
aVertices[1] = new Point(2, 2);
aVertices[2] = new Point(-2, -2);
aVertices[3] = new Point(-4, 0);
aVertices[4] = new Point(0, -2);
bVertices[0] = new Point(4, 1);
bVertices[1] = new Point(2, 3);
bVertices[2] = new Point(-2, -1);
bVertices[3] = new Point(-4, 1);
bVertices[4] = new Point(0, -1);
cVertices[0] = new Point(4, -1);
cVertices[1] = new Point(2, 1);
cVertices[2] = new Point(-2, -3);
cVertices[3] = new Point(-4, -1);
cVertices[4] = new Point(0, -3);
polys[0] = new ConvexPolygon(aVertices, Color.cyan, false);
polys[1] = new ConvexPolygon(bVertices, Color.red, false);
polys[2] = new ConvexPolygon(cVertices, Color.black, false);
System.out.println("Canvas tests...");
// Test an empty Canvas...
pass &= test(canvas.size() == 0, test++);
pass &= test(canvas.getCircles().size() == 0, test++);
pass &= test(canvas.getRectangles().size() == 0, test++);
pass &= test(canvas.getTriangles().size() == 0, test++);
pass &= test(canvas.getConvexPolygons().size() == 0, test++);
pass &= test(canvas.getShapesByColor(Color.cyan).size() == 0, test++);
pass &= test(canvas.getAreaOfAllShapes() == 0, test++);
// Add a shape and test a Canvas with one shape in it...
canvas.add(circles[0]);
pass &= test(canvas.size() == 1, test++);
pass &= test(canvas.getCircles().size() == 1, test++);
pass &= test(canvas.getRectangles().size() == 0, test++);
pass &= test(canvas.getTriangles().size() == 0, test++);
pass &= test(canvas.getConvexPolygons().size() == 0, test++);
pass &= test(canvas.getShapesByColor(Color.black).size() == 0, test++);
pass &= test(canvas.getShapesByColor(Color.cyan).size() == 1, test++);
pass &= test(canvas.getCircles().get(0).equals(circles[0]), test++);
pass &= test(canvas.getShapesByColor(Color.cyan).get(0).equals(circles[0]), test++);
pass &= test(canvas.get(0).equals(circles[0]), test++);
pass &= test(approx(canvas.getAreaOfAllShapes(), circles[0].getArea(), 0.000001), test++);
// Remove a shape and test an empty Canvas...
pass &= test(canvas.remove(0).equals(circles[0]), test++);
pass &= test(canvas.size() == 0, test++);
pass &= test(canvas.getCircles().size() == 0, test++);
pass &= test(canvas.getRectangles().size() == 0, test++);
pass &= test(canvas.getTriangles().size() == 0, test++);
pass &= test(canvas.getConvexPolygons().size() == 0, test++);
pass &= test(canvas.getShapesByColor(Color.cyan).size() == 0, test++);
pass &= test(canvas.getAreaOfAllShapes() == 0, test++);
// Add one of each shape and test...
canvas.add(circles[0]);
canvas.add(rects[0]);
canvas.add(tris[0]);
canvas.add(polys[0]);
pass &= test(canvas.size() == 4, test++);
pass &= test(canvas.getCircles().size() == 1, test++);
pass &= test(canvas.getRectangles().size() == 1, test++);
pass &= test(canvas.getTriangles().size() == 1, test++);
pass &= test(canvas.getConvexPolygons().size() == 1, test++);
pass &= test(canvas.getShapesByColor(Color.black).size() == 0, test++);
pass &= test(canvas.getShapesByColor(Color.cyan).size() == 4, test++);
pass &= test(canvas.getCircles().get(0).equals(circles[0]), test++);
pass &= test(canvas.getRectangles().get(0).equals(rects[0]), test++);
pass &= test(canvas.getTriangles().get(0).equals(tris[0]), test++);
pass &= test(canvas.getConvexPolygons().get(0).equals(polys[0]), test++);
area = circles[0].getArea();
area += rects[0].getArea();
area += tris[0].getArea();
area += polys[0].getArea();
pass &= test(approx(canvas.getAreaOfAllShapes(), area, 0.000001), test++);
// Remove a shape and test again...
canvas.remove(2);
pass &= test(canvas.size() == 3, test++);
pass &= test(canvas.getCircles().size() == 1, test++);
pass &= test(canvas.getRectangles().size() == 1, test++);
pass &= test(canvas.getTriangles().size() == 0, test++);
pass &= test(canvas.getConvexPolygons().size() == 1, test++);
pass &= test(canvas.getShapesByColor(Color.black).size() == 0, test++);
pass &= test(canvas.getShapesByColor(Color.cyan).size() == 3, test++);
pass &= test(canvas.getCircles().get(0).equals(circles[0]), test++);
pass &= test(canvas.getRectangles().get(0).equals(rects[0]), test++);
pass &= test(canvas.getConvexPolygons().get(0).equals(polys[0]), test++);
area -= tris[0].getArea();
pass &= test(approx(canvas.getAreaOfAllShapes(), area, 0.000001), test++);
// Add more shapes and test again...
canvas.add(tris[0]);
area += tris[0].getArea();
for (int i = 1; i < 3; i++) {
canvas.add(circles[i]);
canvas.add(rects[i]);
canvas.add(tris[i]);
canvas.add(polys[i]);
area += circles[i].getArea();
area += rects[i].getArea();
area += tris[i].getArea();
area += polys[i].getArea();
}
pass &= test(canvas.size() == 12, test++);
pass &= test(canvas.getCircles().size() == 3, test++);
pass &= test(canvas.getRectangles().size() == 3, test++);
pass &= test(canvas.getTriangles().size() == 3, test++);
pass &= test(canvas.getConvexPolygons().size() == 3, test++);
pass &= test(canvas.getShapesByColor(Color.black).size() == 4, test++);
pass &= test(canvas.getShapesByColor(Color.cyan).size() == 4, test++);
pass &= test(canvas.getShapesByColor(Color.white).size() == 0, test++);
pass &= test(canvas.get(8).equals(circles[2]), test++);
pass &= test(canvas.get(9).equals(rects[2]), test++);
pass &= test(canvas.get(10).equals(tris[2]), test++);
pass &= test(canvas.get(11).equals(polys[2]), test++);
pass &= test(approx(canvas.getAreaOfAllShapes(), area, 0.000001), test++);
// Remove a couple of shapes and test again...
pass &= test(canvas.remove(0).equals(circles[0]), test++);
pass &= test(canvas.remove(10).equals(polys[2]), test++);
pass &= test(canvas.remove(7).equals(circles[2]), test++);
pass &= test(canvas.size() == 9, test++);
pass &= test(canvas.getCircles().size() == 1, test++);
pass &= test(canvas.getRectangles().size() == 3, test++);
pass &= test(canvas.getTriangles().size() == 3, test++);
pass &= test(canvas.getConvexPolygons().size() == 2, test++);
pass &= test(canvas.getShapesByColor(Color.black).size() == 2, test++);
pass &= test(canvas.getShapesByColor(Color.cyan).size() == 3, test++);
pass &= test(canvas.getShapesByColor(Color.white).size() == 0, test++);
area -= circles[0].getArea();
area -= polys[2].getArea();
area -= circles[2].getArea();
pass &= test(approx(canvas.getAreaOfAllShapes(), area, 0.000001), test++);
return pass;
}
protected void addImage(Image i) {
canvas.add(i);
}
@Override
protected void addText(Text t) {
canvas.add(t);
}
@Override
protected void addPath(Path p) {
canvas.add(p);
}
/**
* The draw method doesn't actually draw anything, but rather appends grobs to the canvas. When
* the canvas gets drawn, this grob will be drawn also.
*
* @param grob the grob to append to the canvas
*/
public void draw(Grob grob) {
canvas.add(grob);
}