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Step 4
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| // Step 4 | |
| class GDIBrush implements PointRenderer { | |
| private int colorId; | |
| public void draw(List<Point> renderingRoots, | |
| ColorMatrix colors, | |
| List<Point> selection) { | |
| Renderer renderer = new Renderer(this, renderingRoots, colors, selection); | |
| renderer.draw(); // !!! -> we call the method object | |
| } | |
| @Override | |
| public void drawPoint(int x, int y, Color color) { | |
| // some code to draw a point... | |
| } | |
| @Override | |
| public int getColorId() { | |
| return colorId; | |
| } | |
| } | |
| interface PointRenderer { | |
| int getColorId(); | |
| void drawPoint(int x, int y, Color color); | |
| } | |
| class Renderer { | |
| private final PointRenderer pointRenderer; | |
| private final List<Point> renderingRoots; | |
| private final ColorMatrix colors; | |
| private final List<Point> selection; | |
| public Renderer(PointRenderer pointRenderer, List<Point> renderingRoots, ColorMatrix colors, List<Point> selection) { | |
| this.pointRenderer = pointRenderer; | |
| this.renderingRoots = renderingRoots; | |
| this.colors = colors; | |
| this.selection = selection; | |
| } | |
| public void draw() { | |
| // some more code in the method | |
| for (Point point : renderingRoots) { | |
| // a lot more code in the loop | |
| pointRenderer.drawPoint(point.x(), point.y(), colors.getColor(pointRenderer.getColorId())); | |
| } | |
| // a lot more code in the method | |
| } | |
| } |
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