private void drawAlphaPanel(Canvas canvas) {
if (!mShowAlphaPanel || mAlphaRect == null || mAlphaPattern == null) return;
final RectF rect = mAlphaRect;
if (BORDER_WIDTH_PX > 0) {
mBorderPaint.setColor(mBorderColor);
canvas.drawRect(
rect.left - BORDER_WIDTH_PX,
rect.top - BORDER_WIDTH_PX,
rect.right + BORDER_WIDTH_PX,
rect.bottom + BORDER_WIDTH_PX,
mBorderPaint);
}
mAlphaPattern.draw(canvas);
float[] hsv = new float[] {mHue, mSat, mVal};
int color = Color.HSVToColor(hsv);
int acolor = Color.HSVToColor(0, hsv);
mAlphaShader =
new LinearGradient(
rect.left, rect.top, rect.right, rect.top, color, acolor, TileMode.CLAMP);
mAlphaPaint.setShader(mAlphaShader);
canvas.drawRect(rect, mAlphaPaint);
if (mAlphaSliderText != null && mAlphaSliderText != "") {
canvas.drawText(
mAlphaSliderText, rect.centerX(), rect.centerY() + 4 * mDensity, mAlphaTextPaint);
}
float rectWidth = 4 * mDensity / 2;
Point p = alphaToPoint(mAlpha);
RectF r = new RectF();
r.left = p.x - rectWidth;
r.right = p.x + rectWidth;
r.top = rect.top - RECTANGLE_TRACKER_OFFSET;
r.bottom = rect.bottom + RECTANGLE_TRACKER_OFFSET;
canvas.drawRoundRect(r, 2, 2, mHueTrackerPaint);
}
private void setUpAlphaRect() {
if (!mShowAlphaPanel) return;
final RectF dRect = mDrawingRect;
float left = dRect.left + BORDER_WIDTH_PX;
float top = dRect.bottom - ALPHA_PANEL_HEIGHT + BORDER_WIDTH_PX;
float bottom = dRect.bottom - BORDER_WIDTH_PX;
float right = dRect.right - BORDER_WIDTH_PX;
mAlphaRect = new RectF(left, top, right, bottom);
mAlphaPattern = new AlphaPatternDrawable((int) (5 * mDensity));
mAlphaPattern.setBounds(
Math.round(mAlphaRect.left),
Math.round(mAlphaRect.top),
Math.round(mAlphaRect.right),
Math.round(mAlphaRect.bottom));
}