Canvas.drawTextOnPath（...）不工作棒棒糖 [英] Canvas.drawTextOnPath(...) not working on Lollipop

问题描述

canvas.DrawTextOnPath似乎并没有工作棒棒糖设备上。看到其中的差别在这里。 （Nexus的10 形象是正确的，但棒棒堂不会正确显示）

canvas.DrawTextOnPath does not seem to work on a Lollipop device. See the difference here. (The Nexus 10 image is correct but Lollipop does not display correctly)

在code是一个简单的路径平局。

The code is a simple path draw.

// Path for the inner circle
unitPath = new Path();
unitPath.addArc(unitRect, 180.0f, 180.0f);

// Draw the text and the path
canvas.drawTextOnPath("Inner Circle", unitPath, 0.0f, 0.0f, unitPaint);
canvas.drawPath(unitPath,unitPaint);

Android的Studio测试项目说明这个问题可以看这里的人谁愿意看到它。 https://dl.dropboxusercontent.com/u/6768304/WebLinks/TestApp.rar

The Android Studio test project illustrating this issue can be seen here for anyone who wants to see it. https://dl.dropboxusercontent.com/u/6768304/WebLinks/TestApp.rar

有什么不同我需要做此设备上？

Is there something "different" I need to do on this device?

推荐答案

确定这样看来，DrawTextOnPath被一点点打破现在低于1.0F的字体大小

OK so it seems that DrawTextOnPath is a little broken now with font sizes below 1.0f

解决的办法是按比例的一切行动，绘制文本又缩了回去。

The solution is to scale everything up, draw the text then shrink it back down.

在示范项目的drawTitle方法将改变从这样的：

The drawTitle method in the demo project would change from this:

private void drawTitle(Canvas canvas) {
    canvas.drawTextOnPath(upperTitle, upperTitlePath, 0.0f, 0.02f, unitPaint);
    canvas.drawTextOnPath(lowerTitle, lowerTitlePath, 0.0f, 0.0f, unitPaint);
    canvas.drawTextOnPath(unitTitle, unitPath, 0.0f, 0.0f, unitPaint);
    canvas.drawPath(unitPath,unitPaint);
}

这样：

private void drawTitle(Canvas canvas) {
    //Save original font size
    float originalTextSize = unitPaint.getTextSize();

    // set a magnification factor
    final float magnifier = 100f;

    // Scale the canvas
    canvas.save();
    canvas.scale(1f / magnifier, 1f / magnifier);

    // create new rects and paths based on the new scale
    unitRect = new RectF();
    unitRect.set((faceRect.left + unitPosition) * magnifier, (faceRect.top + unitPosition) * magnifier, (faceRect.right - unitPosition) * magnifier, (faceRect.bottom - unitPosition) * magnifier);
    unitPath = new Path();
    unitPath.addArc(unitRect, 180.0f, 180.0f);

    titleRect = new RectF();
    titleRect.set((faceRect.left + titlePosition) * magnifier, (faceRect.top + titlePosition) * magnifier, (faceRect.right - titlePosition) * magnifier, (faceRect.bottom - titlePosition) * magnifier);
    upperTitlePath = new Path();
    upperTitlePath.addArc(titleRect, 180.0f, 180.0f);

    titleRect = new RectF();
    titleRect.set((faceRect.left + titlePosition) * magnifier, (faceRect.top + titlePosition) * magnifier, (faceRect.right - titlePosition) * magnifier, (faceRect.bottom - titlePosition) * magnifier);
    lowerTitlePath = new Path();
    lowerTitlePath.addArc(titleRect, -180.0f, -180.0f);

    // increase the font size
    unitPaint.setTextSize(originalTextSize * magnifier);

    // do the drawing of the text
    canvas.drawTextOnPath(unitTitle, unitPath, 0.0f, 0.0f, unitPaint);
    canvas.drawTextOnPath(upperTitle, upperTitlePath, 0.0f, 0.02f, unitPaint);
    canvas.drawTextOnPath(lowerTitle, lowerTitlePath, 0.0f, 0.0f, unitPaint);

    // bring everything back to normal
    canvas.restore();
    unitPaint.setTextSize(originalTextSize);

    canvas.drawPath(unitPath, unitPaint);
}

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