public void onDraw(Canvas canvas) {
// 검정색 배경으로 지운다. 빈 화면이면 지우기만 하고 리턴
canvas.drawColor(Color.BLACK);
if (status == BLANK) {
return;
}
// 도형 목록을 순회하면서 도형 정보대로 출력한다.
int idx;
for (idx = 0; idx < arShape.size(); idx++) {
Paint Pnt = new Paint();
Pnt.setAntiAlias(true);
Pnt.setColor(arShape.get(idx).color);
Rect rt = arShape.get(idx).rt;
switch (arShape.get(idx).what) {
case Shape.RECT:
canvas.drawRect(rt, Pnt);
break;
case Shape.CIRCLE:
canvas.drawCircle(
rt.left + rt.width() / 2, rt.top + rt.height() / 2, rt.width() / 2, Pnt);
break;
case Shape.TRIANGLE:
Path path = new Path();
path.moveTo(rt.left + rt.width() / 2, rt.top);
path.lineTo(rt.left, rt.bottom);
path.lineTo(rt.right, rt.bottom);
canvas.drawPath(path, Pnt);
break;
}
}
}
/**
* Renders the plot onto a canvas. Used by both main thread to draw directly onto the View's
* canvas as well as by background draw to render onto a Bitmap buffer. At the end of the day this
* is the main entry for a plot's "heavy lifting".
*
* @param canvas
*/
protected synchronized void renderOnCanvas(Canvas canvas) {
try {
// any series interested in synchronizing with plot should
// implement PlotListener.onBeforeDraw(...) and do a read lock from within its
// invocation. This is the entry point into that call:
notifyListenersBeforeDraw(canvas);
try {
// need to completely erase what was on the canvas before redrawing, otherwise
// some odd aliasing artifacts begin to build up around the edges of aa'd entities
// over time.
canvas.drawColor(Color.TRANSPARENT, PorterDuff.Mode.CLEAR);
if (backgroundPaint != null) {
drawBackground(canvas, displayDims.marginatedRect);
}
layoutManager.draw(canvas);
if (getBorderPaint() != null) {
drawBorder(canvas, displayDims.marginatedRect);
}
} catch (PlotRenderException e) {
Log.e(TAG, "Exception while rendering Plot.", e);
} catch (Exception e) {
Log.e(TAG, "Exception while rendering Plot.", e);
}
} finally {
isIdle = true;
// any series interested in synchronizing with plot should
// implement PlotListener.onAfterDraw(...) and do a read unlock from within that
// invocation. This is the entry point for that invocation.
notifyListenersAfterDraw(canvas);
}
}
