Canvas 学习之 (4) rotate
2016-07-22 16:03
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Canvas 中的 rotate 是旋转。
如果看了之前的scale缩放那么rotate旋转是很容易学习的
rotate也有2个构造方法
rotate(旋转角度)
rotate(旋转角度,x轴坐标,y轴坐标)
做法可以用坐标做
也可以translate找到位置做
以下这段代码是画了一个时钟:
public class StudyRoateView extends View {
private Paint paint;
public StudyRoateView(Context context) {
super(context);
}
public StudyRoateView(Context context, AttributeSet attrs) {
super(context, attrs);
paint = new Paint();
paint.setColor(Color.BLACK);
paint.setStyle(Paint.Style.STROKE);
paint.setStrokeWidth(2);
paint.setTextSize(13);
}
public StudyRoateView(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
}
@Override
protected void onDraw(Canvas canvas) {
canvas.drawColor(Color.WHITE);
canvas.drawCircle(200, 150, 140, paint);
canvas.drawCircle(200, 150, 130, paint);
canvas.translate(200, 150);
for(int i = 0; i <= 60; i++){
if(i%15 == 0){
canvas.drawLine(0,-130,0,-100,paint);
canvas.drawText(i/5+"",0-5,-90,paint);
}
if(i%5 == 0 && i%15 != 0){
canvas.drawLine(0,-130,0,-110,paint);
canvas.drawText(i/5+"",0-5,-100,paint);
}
if(i%5 !=0 ){
canvas.drawLine(0,-130,0,-120,paint);
}
canvas.rotate(6);
}
canvas.save();
paint.setStrokeWidth(4);
canvas.rotate(24);
canvas.drawLine(0,0,0,-70,paint);
canvas.restore();
paint.setStrokeWidth(5);
canvas.rotate(42);
canvas.drawLine(0,0,0,-50,paint);
super.onDraw(canvas);
}
}
如果看了之前的scale缩放那么rotate旋转是很容易学习的
rotate也有2个构造方法
rotate(旋转角度)
rotate(旋转角度,x轴坐标,y轴坐标)
做法可以用坐标做
也可以translate找到位置做
以下这段代码是画了一个时钟:
public class StudyRoateView extends View {
private Paint paint;
public StudyRoateView(Context context) {
super(context);
}
public StudyRoateView(Context context, AttributeSet attrs) {
super(context, attrs);
paint = new Paint();
paint.setColor(Color.BLACK);
paint.setStyle(Paint.Style.STROKE);
paint.setStrokeWidth(2);
paint.setTextSize(13);
}
public StudyRoateView(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
}
@Override
protected void onDraw(Canvas canvas) {
canvas.drawColor(Color.WHITE);
canvas.drawCircle(200, 150, 140, paint);
canvas.drawCircle(200, 150, 130, paint);
canvas.translate(200, 150);
for(int i = 0; i <= 60; i++){
if(i%15 == 0){
canvas.drawLine(0,-130,0,-100,paint);
canvas.drawText(i/5+"",0-5,-90,paint);
}
if(i%5 == 0 && i%15 != 0){
canvas.drawLine(0,-130,0,-110,paint);
canvas.drawText(i/5+"",0-5,-100,paint);
}
if(i%5 !=0 ){
canvas.drawLine(0,-130,0,-120,paint);
}
canvas.rotate(6);
}
canvas.save();
paint.setStrokeWidth(4);
canvas.rotate(24);
canvas.drawLine(0,0,0,-70,paint);
canvas.restore();
paint.setStrokeWidth(5);
canvas.rotate(42);
canvas.drawLine(0,0,0,-50,paint);
super.onDraw(canvas);
}
}
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