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我想使餅圖可點擊。我正在研究在afreechart網站上發佈的示例(用於生成條形圖和餅圖)。我試圖理解它,通過使餅圖可點擊,我會進一步。 的例子可以在這裏找到:https://code.google.com/p/afreechart/如何製作餅圖可點擊?
View類
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);
}
活動
然後我想點擊的區域(例如紅色區域),以顯示消息。 問題是因爲我知道圖表是從afreechart網站的示例代碼中繪製出來的,我可以去不同顏色的每個區域,單擊並顯示一條適當的消息,但圖表隱藏了一些東西(它不可見) 。問題是,也許是因爲我使用的位圖和畫布的方式......
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;
}
}
,請我很高興能得到您的幫助......這實在是令人沮喪的,因爲首先我是新來的Android和我可以看到沒有真正看到圖表顯示正確的消息
我甚至可以在onDraw(Canvas canvas)中做到這一點,像canvas =新的畫布(位圖),但具有相同的結果。我已經沒有想法了。關鍵是要了解Canvas與創建的位圖關聯的方式......我需要你的幫助 – ozzycoca 2013-03-10 21:26:41