android游戏开发中，，使用android.graphics中的类来绘制2D向量图和文字。一 画布Canvas在Android中的绘图应该继承View组件，并重写它的onDraw(Canvas canvas)方法。Canvas代表指定View上的画布，常用方法如图：
构造函数有两个：
Canvas() 创建一张空的画布Canvas(Bitmap bitmap) 使用指定的位图创建一张画布
二 画刷PaintPaint代表Canvas上的画刷，主要用于绘制风格，包括画刷颜色、画刷笔触粗细、填充风格等。大体上可以分为两类，一类与图形绘制相关，一类与文本绘制相关。常用方法如图：
三 路径PathPath表示在Canvas上绘制的路径，可以是任意多条直线连接而成的任意图形。四 示例protected void onDraw(Canvas canvas) { super.onDraw(canvas); // 把整张画布绘制成白色canvas.drawColor(Color.WHITE);// 创建一个画刷Paint paint = new Paint();// 设置画刷属性paint.setAntiAlias(true);// 去锯齿paint.setColor(Color.RED);// 设置画刷颜色为红色paint.setStyle(Paint.Style.STROKE);// 设置画刷样式为空心paint.setStrokeWidth(3);// 设置paint的外框宽度// 画一个空心圆形canvas.drawCircle(40, 40, 30, paint);// 画一个空心正方形canvas.drawRect(10, 90, 70, 150, paint);// 画一个空心长方形canvas.drawRect(10, 170, 70,200, paint);// 画一个空心椭圆形RectF re=new RectF(10,220,70,250);canvas.drawOval(re, paint);// 画一个空心三角形Path path=new Path();path.moveTo(10, 330);path.lineTo(70,330);path.lineTo(40,270);path.close();canvas.drawPath(path, paint);// 画一个空心梯形Path path1=new Path();path1.moveTo(10, 410);path1.lineTo(70,410);path1.lineTo(55,350);path1.lineTo(25, 350);path1.close();canvas.drawPath(path1, paint);// 修改画刷属性paint.setStyle(Paint.Style.FILL);// 设置画刷样式为实心paint.setColor(Color.BLUE);// 设置画刷颜色// 画一个实心圆canvas.drawCircle(120,40,30, paint);// 画一个实心正方形canvas.drawRect(90, 90, 150, 150, paint);// 画一个实心长方形canvas.drawRect(90, 170, 150,200, paint);// 画一个实心椭圆RectF re2=new RectF(90,220,150,250);canvas.drawOval(re2, paint);// 画一个实心三角形Path path2=new Path();path2.moveTo(90, 330);path2.lineTo(150,330);path2.lineTo(120,270);path2.close();canvas.drawPath(path2, paint);// 画一个实心梯形Path path3=new Path();path3.moveTo(90, 410);path3.lineTo(150,410);path3.lineTo(135,350);path3.lineTo(105, 350);path3.close();canvas.drawPath(path3, paint);// 设置渐变色Shader mShader=new LinearGradient(0,0,100,100,new int[]{Color.RED,Color.GREEN,Color.BLUE,Color.YELLOW},null,Shader.TileMode.REPEAT);paint.setShader(mShader);// 画一个渐变色圆canvas.drawCircle(200,40,30, paint);// 画一个渐变色正方形canvas.drawRect(170, 90, 230, 150, paint);// 画一个渐变色长方形canvas.drawRect(170, 170, 230,200, paint);// 画一个渐变色椭圆RectF re3=new RectF(170,220,230,250);canvas.drawOval(re3, paint);// 画一个渐变色三角形Path path4=new Path();path4.moveTo(170,330);path4.lineTo(230,330);path4.lineTo(200,270);path4.close();canvas.drawPath(path4, paint);// 画一个渐变色梯形Path path5=new Path();path5.moveTo(170, 410);path5.lineTo(230,410);path5.lineTo(215,350);path5.lineTo(185, 350);path5.close();canvas.drawPath(path5, paint);// 绘制文字paint.setTextSize(24);// 设置字号canvas.drawText(getResources().getString(R.string.str_text1), 240, 50, paint);canvas.drawText(getResources().getString(R.string.str_text2), 240, 120, paint);canvas.drawText(getResources().getString(R.string.str_text3), 240, 190, paint);canvas.drawText(getResources().getString(R.string.str_text4), 240, 250, paint);canvas.drawText(getResources().getString(R.string.str_text5), 240, 320, paint);canvas.drawText(getResources().getString(R.string.str_text6), 240, 390, paint); }
四 效果图
参考文章:
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