Examples with LinearGradient android.graphics.LinearGradient used on opensource projects

Example 31 with LinearGradient

use of android.graphics.LinearGradient in project XCL-Charts by xcltapestry.

the class PlotAreaRender method drawPlotBackground.

/**
	 * 绘制背景
	 */
protected void drawPlotBackground(Canvas canvas) {
    if (null == canvas)
        return;
    if (getBackgroundColorVisible()) {
        if (getApplayGradient()) {
            LinearGradient linearGradient;
            if (getGradientDirection() == XEnum.Direction.VERTICAL) {
                linearGradient = new LinearGradient(0, 0, 0, getBottom() - getTop(), getBeginColor(), getEndColor(), getGradientMode());
            } else {
                linearGradient = new LinearGradient(getLeft(), getBottom(), getRight(), getTop(), getBeginColor(), getEndColor(), getGradientMode());
            }
            getBackgroundPaint().setShader(linearGradient);
        } else {
            getBackgroundPaint().setShader(null);
        }
        canvas.drawRect(mLeft, mTop, mRight, mBottom, getBackgroundPaint());
    }
}

Example 32 with LinearGradient

use of android.graphics.LinearGradient in project XCL-Charts by xcltapestry.

the class AreaChart method renderBezierArea.

private boolean renderBezierArea(Canvas canvas, Paint paintAreaFill, Path bezierPath, AreaData areaData, List<PointF> lstPathPoints) {
    int count = lstPathPoints.size();
    if (count < 3)
        // 没有或仅一个点就不需要了
        return false;
    // 设置当前填充色
    paintAreaFill.setColor(areaData.getAreaFillColor());
    // 仅两点
    if (count == 3) {
        if (null == bezierPath)
            bezierPath = new Path();
        bezierPath.moveTo(lstPathPoints.get(0).x, plotArea.getBottom());
        bezierPath.lineTo(lstPathPoints.get(0).x, lstPathPoints.get(0).y);
        PointF ctl3 = PointHelper.percent(lstPathPoints.get(1), 0.5f, lstPathPoints.get(2), 0.8f);
        bezierPath.quadTo(ctl3.x, ctl3.y, lstPathPoints.get(2).x, lstPathPoints.get(2).y);
        // canvas.drawCircle(ctl3.x, ctl3.y, 10.f, paintAreaFill); //显示控制点
        bezierPath.lineTo(lstPathPoints.get(2).x, plotArea.getBottom());
        bezierPath.close();
        if (areaData.getApplayGradient()) {
            LinearGradient linearGradient;
            if (areaData.getGradientDirection() == XEnum.Direction.VERTICAL) {
                float lineMaxY = getLineMaxMinY(Y_MAX, lstPathPoints);
                linearGradient = new LinearGradient(0, 0, 0, // 2 * h,
                plotArea.getBottom() - lineMaxY, // lstPathPoints.get(count -1).x,lineMinY,
                areaData.getAreaBeginColor(), areaData.getAreaEndColor(), areaData.getGradientMode());
            } else {
                float lineMinY = getLineMaxMinY(Y_MIN, lstPathPoints);
                linearGradient = new LinearGradient(plotArea.getLeft(), plotArea.getBottom(), lstPathPoints.get(2).x, lineMinY, areaData.getAreaBeginColor(), areaData.getAreaEndColor(), areaData.getGradientMode());
            }
            paintAreaFill.setShader(linearGradient);
        } else {
            paintAreaFill.setShader(null);
        }
        canvas.drawPath(bezierPath, paintAreaFill);
        bezierPath.reset();
        return true;
    }
    // 透明度
    paintAreaFill.setAlpha(this.mAreaAlpha);
    // start point
    bezierPath.moveTo(plotArea.getLeft(), plotArea.getBottom());
    float axisMinValue = plotArea.getBottom();
    for (int i = 0; i < count; i++) {
        if (i < 3)
            continue;
        // 连续两个值都为0,控制点有可能会显示在轴以下，则此种情况下，将其处理为直线
        if (lstPathPoints.get(i - 1).y >= axisMinValue && lstPathPoints.get(i).y >= axisMinValue) {
            // 如果最后两点为0时此处调用了两次，最后一次跳过不做处理,原因是数组的最后一个点的y值必定为0
            if (i == count - 1) {
                continue;
            }
            if (null == bezierPath) {
                bezierPath = new Path();
                bezierPath.moveTo(lstPathPoints.get(i - 2).x, lstPathPoints.get(i - 2).y);
            } else {
                bezierPath.lineTo(lstPathPoints.get(i - 2).x, lstPathPoints.get(i - 2).y);
            }
            // change by chenqiang
            if (lstPathPoints.get(i - 2).y >= axisMinValue) {
                //连续3个点为0
                bezierPath.moveTo(lstPathPoints.get(i - 1).x, lstPathPoints.get(i - 1).y);
            } else {
                CurveHelper.curve3(lstPathPoints.get(i - 2), lstPathPoints.get(i - 1), lstPathPoints.get(i - 3), lstPathPoints.get(i), mBezierControls);
                bezierPath.quadTo(mBezierControls[0].x, mBezierControls[0].y, lstPathPoints.get(i - 1).x, lstPathPoints.get(i - 1).y);
            }
            bezierPath.close();
            if (areaData.getApplayGradient()) {
                LinearGradient linearGradient;
                if (areaData.getGradientDirection() == XEnum.Direction.VERTICAL) {
                    float lineMaxY = getLineMaxMinY(Y_MAX, lstPathPoints);
                    linearGradient = new LinearGradient(0, 0, 0, lineMaxY, areaData.getAreaBeginColor(), areaData.getAreaEndColor(), areaData.getGradientMode());
                } else {
                    float lineMinY = getLineMaxMinY(Y_MIN, lstPathPoints);
                    linearGradient = new LinearGradient(plotArea.getLeft(), plotArea.getBottom(), lstPathPoints.get(i - 1).x, lineMinY, areaData.getAreaBeginColor(), areaData.getAreaEndColor(), areaData.getGradientMode());
                }
                paintAreaFill.setShader(linearGradient);
            } else {
                paintAreaFill.setShader(null);
            }
            canvas.drawPath(bezierPath, paintAreaFill);
            bezierPath.reset();
            bezierPath.moveTo(lstPathPoints.get(i).x, lstPathPoints.get(i).y);
            continue;
        }
        CurveHelper.curve3(lstPathPoints.get(i - 2), lstPathPoints.get(i - 1), lstPathPoints.get(i - 3), lstPathPoints.get(i), mBezierControls);
        // change by chenqiang
        bezierCurvePathAxisMinValue(bezierPath, lstPathPoints.get(i - 2), lstPathPoints.get(i - 1), mBezierControls);
    }
    // 最后两点间的区域
    // 通过calcAllPoints函数，stop的y值一定是0
    PointF stop = lstPathPoints.get(count - 1);
    if (lstPathPoints.get(count - 2).y >= axisMinValue) {
        // 最后一点是0
        // change by chenqiang
        CurveHelper.curve3(lstPathPoints.get(count - 3), stop, lstPathPoints.get(count - 4), stop, mBezierControls);
        bezierCurvePathAxisMinValue(bezierPath, lstPathPoints.get(count - 3), stop, mBezierControls);
    } else {
        CurveHelper.curve3(lstPathPoints.get(count - 2), stop, lstPathPoints.get(count - 3), stop, mBezierControls);
        // change by chenqiang
        bezierCurvePathAxisMinValue(bezierPath, lstPathPoints.get(count - 2), lstPathPoints.get(count - 1), mBezierControls);
    }
    bezierPath.close();
    if (areaData.getApplayGradient()) {
        LinearGradient linearGradient;
        if (areaData.getGradientDirection() == XEnum.Direction.VERTICAL) {
            float lineMaxY = getLineMaxMinY(Y_MAX, lstPathPoints);
            linearGradient = new LinearGradient(0, 0, 0, lineMaxY, areaData.getAreaBeginColor(), areaData.getAreaEndColor(), areaData.getGradientMode());
        } else {
            float lineMinY = getLineMaxMinY(Y_MIN, lstPathPoints);
            linearGradient = new LinearGradient(plotArea.getLeft(), plotArea.getBottom(), stop.x, lineMinY, areaData.getAreaBeginColor(), areaData.getAreaEndColor(), areaData.getGradientMode());
        }
        paintAreaFill.setShader(linearGradient);
    } else {
        paintAreaFill.setShader(null);
    }
    canvas.drawPath(bezierPath, paintAreaFill);
    bezierPath.reset();
    return true;
}

Example 33 with LinearGradient

use of android.graphics.LinearGradient in project ZI by yixia.

the class ColorPickerView method drawAlphaPanel.

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);
}

Example 34 with LinearGradient

use of android.graphics.LinearGradient in project ZI by yixia.

the class ColorPickerView method drawSatValPanel.

private void drawSatValPanel(Canvas canvas) {
    final RectF rect = mSatValRect;
    if (BORDER_WIDTH_PX > 0) {
        mBorderPaint.setColor(mBorderColor);
        canvas.drawRect(mDrawingRect.left, mDrawingRect.top, rect.right + BORDER_WIDTH_PX, rect.bottom + BORDER_WIDTH_PX, mBorderPaint);
    }
    if (mValShader == null) {
        mValShader = new LinearGradient(rect.left, rect.top, rect.left, rect.bottom, 0xffffffff, 0xff000000, TileMode.CLAMP);
    }
    int rgb = Color.HSVToColor(new float[] { mHue, 1f, 1f });
    mSatShader = new LinearGradient(rect.left, rect.top, rect.right, rect.top, 0xffffffff, rgb, TileMode.CLAMP);
    ComposeShader mShader = new ComposeShader(mValShader, mSatShader, PorterDuff.Mode.MULTIPLY);
    mSatValPaint.setShader(mShader);
    canvas.drawRect(rect, mSatValPaint);
    Point p = satValToPoint(mSat, mVal);
    mSatValTrackerPaint.setColor(0xff000000);
    canvas.drawCircle(p.x, p.y, PALETTE_CIRCLE_TRACKER_RADIUS - 1f * mDensity, mSatValTrackerPaint);
    mSatValTrackerPaint.setColor(0xffdddddd);
    canvas.drawCircle(p.x, p.y, PALETTE_CIRCLE_TRACKER_RADIUS, mSatValTrackerPaint);
}

Example 35 with LinearGradient

use of android.graphics.LinearGradient in project ZI by yixia.

the class ColorPickerView method drawHuePanel.

private void drawHuePanel(Canvas canvas) {
    final RectF rect = mHueRect;
    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);
    }
    if (mHueShader == null) {
        mHueShader = new LinearGradient(rect.left, rect.top, rect.left, rect.bottom, buildHueColorArray(), null, TileMode.CLAMP);
        mHuePaint.setShader(mHueShader);
    }
    canvas.drawRect(rect, mHuePaint);
    float rectHeight = 4 * mDensity / 2;
    Point p = hueToPoint(mHue);
    RectF r = new RectF();
    r.left = rect.left - RECTANGLE_TRACKER_OFFSET;
    r.right = rect.right + RECTANGLE_TRACKER_OFFSET;
    r.top = p.y - rectHeight;
    r.bottom = p.y + rectHeight;
    canvas.drawRoundRect(r, 2, 2, mHueTrackerPaint);
}