draw 2D

// 绘制点
Paint paint = new Paint();
paint.setColor(Color.WHITE);
paint.setStrokeWidth(6);

canvas.drawPoint(50, 12, paint);
paint.setColor(Color.RED);
paint.setStrokeWidth(12);
canvas.drawPoint(100, 20, paint);

paint.setColor(Color.BLUE);
paint.setStrokeWidth(8);
canvas.drawPoints(new float[]
{ 150, 22, 200, 20 }, paint);
canvas.drawPoints(new float[]
{ 260, 22, 280, 20 }, 2, 2, paint);

// 绘制直线
paint.setColor(Color.WHITE);
paint.setStrokeWidth(4);
canvas.drawLine(20, 40, 160, 40, paint);

paint.setColor(Color.GREEN);
paint.setStrokeWidth(2);

canvas.drawLines(new float[]
{ 30, 60, 200, 90, 30, 90, 200, 60 }, paint);

paint.setColor(Color.YELLOW);
canvas.drawLines(new float[]
{ 30, 100, 300, 100, 36, 20, 120, 30 }, 0, 4, paint);

// 绘制三角形
canvas.save();
canvas.translate(20, 150);
canvas.drawVertices(Canvas.VertexMode.TRIANGLE_FAN, 6, new float[]
{ 100, 50, 0, 0, 200, 0 }, 0, null, 0, null, 0, null, 0, 0, paint);
canvas.restore();

// 绘制矩形和菱形
paint.setStyle(Style.FILL);
canvas.drawRect(120, 210, 180, 255, paint);
paint.setStyle(Style.STROKE);
canvas.drawRect(new Rect(20, 210, 100, 255), paint);

canvas.save();
canvas.translate(20, 260);
canvas.drawVertices(Canvas.VertexMode.TRIANGLE_STRIP, 8, new float[]
{ 70, 0, 10, 50, 130, 50, 70, 100 }, 0, null, 0, null, 0, null, 0, 0,
paint);
canvas.restore();

canvas.save();
canvas.translate(160, 260);
canvas.drawVertices(Canvas.VertexMode.TRIANGLE_FAN, 8, new float[]
{ 70, 0, 10, 50, 130, 50, 70, 100 }, 0, null, 0, null, 0, null, 0, 0,
paint);
canvas.restore();

// 绘制圆、弧和椭圆

canvas.drawCircle(200, 400, 40, paint);

canvas.drawRect(new Rect(10, 370, 70, 410), paint);
canvas.drawArc(new RectF(10, 370, 70, 410), 30, 180, false, paint);
canvas.drawArc(new RectF(100, 320,
4000
160, 470), 30, 180, true, paint);

canvas.drawArc(new RectF(200, 180, 300, 250), 0, 360, false, paint);

//  绘制文本
paint.setColor(Color.WHITE);
paint.setTextSize(40);
paint.setStyle(Style.FILL);

canvas.drawText("文字", 240, 380, paint);
paint.setStyle(Style.STROKE);

canvas.drawText("文字", 240, 440, paint);
}