android繪制直角坐标系,[新人]如何把直角坐标系的坐标轉換為canvas的坐标

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這是X和Y軸的畫圖代碼

int height=getHeight();

int width=getWidth();

float originX=width/2,originY=height/2;

Toast.makeText(chart.this,"坐标系大小為:"+height+"x"+width,Toast.LENGTH_LONG).show();

//x軸

canvas.drawLine(0,height/2,width,height/2,paint);

Path trianglex=new Path();

trianglex.moveTo(width/2,0);trianglex.lineTo(width/2+10,20);trianglex.lineTo(width/2-10,20);trianglex.lineTo(width/2,0);trianglex.close();

canvas.drawPath(trianglex,paint);//箭頭三角形

canvas.drawPosText("X", new float[]{width/2-20,20}, paint);

//y軸

canvas.drawLine(width/2,0,width/2,height,paint);

Path triangley=new Path();

triangley.moveTo(width,height/2);triangley.lineTo(width-20,height/2+10);triangley.lineTo(width-20,height/2-10);triangley.lineTo(width,height/2);triangley.close();

canvas.drawPath(triangley,paint);//箭頭三角形

canvas.drawPosText("Y", new float[]{width-20,height/2+20}, paint);