Android Canvas绘制七巧板

我会带着你远行 2022-07-15 14:46 156阅读 0赞

心血来潮，封装了一个绘制彩色多边形的方法，并用这个方法绘制了一个七巧板（感觉绘制华容道太简单了）

代码如下：

public class CanvasPuzzle extends View {
    
        public CanvasPuzzle(Context context) {
            super(context);
        }
    
        public CanvasPuzzle(Context context, AttributeSet attrs) {
            super(context, attrs);
        }
    
        public CanvasPuzzle(Context context, AttributeSet attrs, int defStyleAttr) {
            super(context, attrs, defStyleAttr);
        }
    
        public CanvasPuzzle(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
            super(context, attrs, defStyleAttr, defStyleRes);
        }
    
        @Override
        protected void onDraw(Canvas canvas) {
            super.onDraw(canvas);
    
            Paint p = new Paint();
            p.setAntiAlias(true);
    
            drawPath(canvas,p,Color.RED, new float[][]{
       {0,0},{512,0},{256,256}});
            drawPath(canvas,p,Color.YELLOW, new float[][]{
       {0,0},{256,256},{0,512}});
            drawPath(canvas,p,Color.GREEN, new float[][]{
       {512,0},{512,256},{384,384},{384,128}});
            drawPath(canvas,p,Color.BLUE, new float[][]{
       {256,256},{384,128},{384,384}});
            drawPath(canvas,p,Color.BLACK, new float[][]{
       {128,384},{256,512},{0,512}});
            drawPath(canvas,p,Color.GRAY, new float[][]{
       {256,256},{384,384},{256,512},{128,384}});
            drawPath(canvas,p,Color.CYAN, new float[][]{
       {256,512},{512,256},{512,512}});
        }
    
        /**
         * 绘制彩色多边形
         * @param canvas Canvas画布
         * @param paint Paint画笔
         * @param color 颜色
         * @param points 二维数组表示多边形的顶点
         */
        private void drawPath(Canvas canvas, Paint paint, @ColorInt int color, float[][] points){
            if (paint == null){
                paint = new Paint();
            }else{
                paint.reset();
            }
            Path path = new Path();
            if (points.length < 3){
                return;
            }
            for (int i=0;i<points.length;i++){
                if (i==0){
                    path.moveTo(points[i][0],points[i][1]);
                }else{
                    path.lineTo(points[i][0],points[i][1]);
                }
            }
            path.close();
            paint.setColor(color);
            canvas.drawPath(path,paint);
        }
    
    }

效果如下

![20161019214427394][]

[20161019214427394]: /images/20220715/87faa3de017f47c6a0be7767c39e4a67.png