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我想使饼图可点击。我正在研究在afreechart网站上发布的示例(用于生成条形图和饼图)。我试图理解它,通过使饼图可点击,我会进一步。 的例子可以在这里找到:https://code.google.com/p/afreechart/如何制作饼图可点击?
View类
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
bitmap = Bitmap.createBitmap(canvas.getWidth(), canvas.getHeight(),
Bitmap.Config.ARGB_8888);
canvas.setBitmap(bitmap);
inertialMove();
paintComponent(canvas);
}
public void paintComponent(Canvas canvas) {
// first determine the size of the chart rendering area...
Dimension size = getSize();
RectangleInsets insets = getInsets();
RectShape available = new RectShape(insets.getLeft(), insets.getTop(),
size.getWidth() - insets.getLeft() - insets.getRight(),
size.getHeight() - insets.getTop() - insets.getBottom());
double drawWidth = available.getWidth();
double drawHeight = available.getHeight();
this.scaleX = 1.0;
this.scaleY = 1.0;
if (drawWidth < this.minimumDrawWidth) {
this.scaleX = drawWidth/this.minimumDrawWidth;
drawWidth = this.minimumDrawWidth;
}
else if (drawWidth > this.maximumDrawWidth) {
this.scaleX = drawWidth/this.maximumDrawWidth;
drawWidth = this.maximumDrawWidth;
}
if (drawHeight < this.minimumDrawHeight) {
this.scaleY = drawHeight/this.minimumDrawHeight;
drawHeight = this.minimumDrawHeight;
}
else if (drawHeight > this.maximumDrawHeight) {
this.scaleY = drawHeight/this.maximumDrawHeight;
drawHeight = this.maximumDrawHeight;
}
RectShape chartArea = new RectShape(0.0, 0.0, drawWidth,
drawHeight);
this.chart.draw(canvas,chartArea, this.anchor, this.info);
}
活动
然后我想点击的区域(例如红色区域),以显示消息。 问题是因为我知道图表是从afreechart网站的示例代码中绘制出来的,我可以去不同颜色的每个区域,单击并显示一条适当的消息,但图表隐藏了一些东西(它不可见) 。问题是,也许是因为我使用的位图和画布的方式......
public boolean onTouchEvent(MotionEvent event){
if(event.getAction()==MotionEvent.ACTION_DOWN){
}
else if (event.getAction()==MotionEvent.ACTION_UP){
int color = bitmap.getPixel((int) event.getX(), (int) event.getY());
System.out.println("color =" +color);
int redValue = Color.red(color);
int blueValue = Color.blue(color);
int greenValue = Color.green(color);
System.out.println("redValue =" +redValue);
System.out.println("blueValue =" +blueValue);
System.out.println("greenValue =" +greenValue);
if (redValue == 255){
Toast.makeText(getBaseContext(), "Is Red", Toast.LENGTH_SHORT).show();
}
if (blueValue == 255){
Toast.makeText(getBaseContext(), "Is BLUE", Toast.LENGTH_SHORT).show();
}
if (greenValue == 255){
Toast.makeText(getBaseContext(), "Is GREEN", Toast.LENGTH_SHORT).show();
}
//}
}
return true;
}
}
,请我很高兴能得到您的帮助......这实在是令人沮丧的,因为首先我是新来的Android和我可以看到没有真正看到图表显示正确的消息
我甚至可以在onDraw(Canvas canvas)中做到这一点,像canvas =新的画布(位图),但具有相同的结果。我已经没有想法了。关键是要了解Canvas与创建的位图关联的方式......我需要你的帮助 – ozzycoca 2013-03-10 21:26:41