我正在研究地图叠加层,它突出显示沿指定点的路线,我需要实现某些线条样式(类似于截图)
我正在尝试做的是用两条边用黑色笔划线的透明线条突出显示路线
到目前为止,玩不同的填充样式和Paint设置并没有让我找到任何解决方案.
有谁知道我需要找什么方向？
目前我设法只绘制实线,但这不是我想要的：
油漆设置：
mPaint.setStyle(Paint.Style.STROKE); mPaint.setColor(COLOR_DEFAULT); mPaint.setPathEffect(new CornerPathEffect(10)); mPaint.setStrokeWidth(6); mPaint.setAntiAlias(true);
绘图程序
canvas.drawPath(mPath,mPaint);
解决方法
使用“破折号标记”(两个非常薄的矩形和MORPH样式选项),PathDashPathEffect得到了相当不错的结果.在这里查看最后一行和第三行：
这是通过修改从SDK获取的ApiDemos中的PathEffects示例得出的：
package com.example.android.apis.graphics;
import android.content.Context;
import android.graphics.*;
import android.os.Bundle;
import android.view.KeyEvent;
import android.view.View;
public class PathEffects extends GraphicsActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(new SampleView(this));
}
private static class SampleView extends View {
private Paint mPaint;
private Path mPath;
private PathEffect[] mEffects;
private int[] mColors;
private float mPhase = 3;
private static void makeEffects(PathEffect[] e,float phase) {
e[0] = null; // no effect
e[1] = new CornerPathEffect(10);
e[2] = new DashPathEffect(new float[] {10,5,5},phase);
e[3] = new PathDashPathEffect(makePathDash(),12,phase,PathDashPathEffect.Style.MORPH);
e[4] = new ComposePathEffect(e[2],e[1]);
e[5] = new ComposePathEffect(e[3],e[1]);
}
public SampleView(Context context) {
super(context);
setFocusable(true);
setFocusableInTouchMode(true);
mPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
mPaint.setStyle(Paint.Style.STROKE);
mPaint.setStrokeWidth(6);
mPath = makeFollowPath();
mEffects = new PathEffect[6];
mColors = new int[] { Color.BLACK,Color.RED,Color.BLUE,Color.GREEN,Color.MAGENTA,Color.BLACK
};
}
@Override protected void onDraw(Canvas canvas) {
canvas.drawColor(Color.WHITE);
RectF bounds = new RectF();
mPath.computeBounds(bounds,false);
canvas.translate(10 - bounds.left,10 - bounds.top);
makeEffects(mEffects,mPhase);
invalidate();
for (int i = 0; i < mEffects.length; i++) {
mPaint.setPathEffect(mEffects[i]);
mPaint.setColor(mColors[i]);
canvas.drawPath(mPath,mPaint);
canvas.translate(0,28);
}
}
@Override public boolean onKeyDown(int keyCode,KeyEvent event) {
switch (keyCode) {
case KeyEvent.KEYCODE_DPAD_CENTER:
mPath = makeFollowPath();
return true;
}
return super.onKeyDown(keyCode,event);
}
private static Path makeFollowPath() {
Path p = new Path();
p.moveTo(0,0);
for (int i = 1; i <= 15; i++) {
p.lineTo(i*20,(float)Math.random() * 35);
}
return p;
}
private static Path makePathDash() {
Path p = new Path();
p.moveTo(-6,4);
p.lineTo(6,3);
p.lineTo(-6,3);
p.close();
p.moveTo(-6,-4);
p.lineTo(6,-3);
p.lineTo(-6,-3);
return p;
}
}
}
