android通过canvas旋转,绘制文字,竖直等不同方向的显示
效果如下:主体代码如下:
package com.free.chart;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.view.Su易做图ceHolder;
import android.view.Su易做图ceView;
public class DrawTextStudy extends Su易做图ceView implements Su易做图ceHolder.Callback {
Su易做图ceHolder holder;
public DrawTextStudy(Context context) {
super(context);
// TODO Auto-generated constructor stub
holder = this.getHolder();
holder.addCallback(this);
}
@Override
public void su易做图ceChanged(Su易做图ceHolder holder, int format, int width,
int height) {
// TODO Auto-generated method stub
}
@Override
public void su易做图ceCreated(Su易做图ceHolder holder) {
// TODO Auto-generated method stub
new Thread(new MyThread()).start();
}
@Override
public void su易做图ceDestroyed(Su易做图ceHolder holder) {
// TODO Auto-generated method stub
}
void drawText(Canvas canvas ,String text , float x ,float y,Paint paint ,float angle){
if(angle != 0){
canvas.rotate(angle, x, y);
}
canvas.drawText(text, x, y, paint);
if(angle != 0){
canvas.rotate(-angle, x, y);
}
}
class MyThread implements Runnable{
@Override
public void run() {
// TODO Auto-generated method stub
Canvas canvas = null;
try{
canvas = holder.lockCanvas();
Paint paint = new Paint();
paint.setColor(Color.WHITE);
paint.setTextSize(20);
canvas.drawLine(100, 100, 100, 400, paint);
drawText(canvas,"Hello", 80, 200, paint,-90);
paint.setColor(Color.RED);
paint.setTextSize(40);
drawText(canvas,"free", 150, 180, paint,-45);
paint.setColor(Color.BLUE);
drawText(canvas,"World", 150, 80, paint,0);
canvas.drawLine(100, 100, 400, 100, paint);
} catch(Exception e){
} finally {
holder.unlockCanvasAndPost(canvas);
}
}
}
}
activity调用
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(new DrawTextStudy(this));
}
摘自 freeliver54
补充:移动开发 , Android ,