Selasa, 06 Mei 2014

ComposePathEffect example

android.graphics.ComposePathEffect create PathEffect from other two PathEffects, to apply first the inner effect and the outer pathEffect.

Here is a example to create ComposePathEffect from CornerPathEffect and DashPathEffect, in various combination.



Where:

  • paint0: no effect
  • paint1: CornerPathEffect
  • paint2: DashPathEffect
  • paint3: ComposePathEffect(cornerPathEffect, dashPathEffect)
  • paint4: ComposePathEffect(dashPathEffect, cornerPathEffect)
  • paint5: ComposePathEffect(cornerPathEffect, cornerPathEffect)
  • ComposePathEffect(another dashPathEffect, dashPathEffect)

Modify MyView.java from the post.
package com.example.androidview;

import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.ComposePathEffect;
import android.graphics.CornerPathEffect;
import android.graphics.DashPathEffect;
import android.graphics.Paint;
import android.graphics.Path;
import android.util.AttributeSet;
import android.view.View;

public class MyView extends View {

Paint paint0, paint1, paint2, paint3, paint4, paint5, paint6;
Path path;

public MyView(Context context) {
super(context);
init();
}

public MyView(Context context, AttributeSet attrs) {
super(context, attrs);
init();
}

public MyView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
init();
}

private void init() {
paint0 = new Paint();
paint0.setColor(Color.BLACK);
paint0.setStrokeWidth(10);
paint0.setStyle(Paint.Style.STROKE);

paint1 = new Paint();
paint1.set(paint0);
paint1.setColor(Color.RED);

paint2 = new Paint();
paint2.set(paint0);
paint2.setColor(Color.GREEN);

paint3 = new Paint();
paint3.set(paint0);
paint3.setColor(Color.BLUE);

paint4 = new Paint();
paint4.set(paint0);
paint4.setColor(Color.CYAN);

paint5 = new Paint();
paint5.set(paint0);
paint5.setColor(Color.MAGENTA);

paint6 = new Paint();
paint6.set(paint0);
paint6.setColor(Color.GRAY);

path = new Path();
path.moveTo(20, 20);
path.lineTo(20, 60);
path.lineTo(100, 80);
path.lineTo(10, 150);
path.lineTo(20, 200);
path.lineTo(20, 500);
path.lineTo(100, 500);
path.lineTo(100, 300);
path.lineTo(150, 300);

float radius = 50.0f;
CornerPathEffect cornerPathEffect =
new CornerPathEffect(radius);

float[] intervals = new float[]{80.0f, 30.0f};
float phase = 0;
DashPathEffect dashPathEffect =
new DashPathEffect(intervals, phase);

ComposePathEffect composePathEffect3 =
new ComposePathEffect(cornerPathEffect, dashPathEffect);
ComposePathEffect composePathEffect4 =
new ComposePathEffect(dashPathEffect, cornerPathEffect);
ComposePathEffect composePathEffect5 =
new ComposePathEffect(cornerPathEffect, cornerPathEffect);

float[] intervals6 = new float[]{5.0f, 5.0f};
float phase6 = 0;
DashPathEffect dashPathEffect6 =
new DashPathEffect(intervals6, phase6);
ComposePathEffect composePathEffect6 =
new ComposePathEffect(dashPathEffect6, dashPathEffect);

paint1.setPathEffect(cornerPathEffect);
paint2.setPathEffect(dashPathEffect);
paint3.setPathEffect(composePathEffect3);
paint4.setPathEffect(composePathEffect4);
paint5.setPathEffect(composePathEffect5);
paint6.setPathEffect(composePathEffect6);

}

@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
canvas.drawPath(path, paint0); //no effect
canvas.translate(150, 0);
canvas.drawPath(path, paint1);
canvas.translate(150, 0);
canvas.drawPath(path, paint2);
canvas.translate(150, 0);
canvas.drawPath(path, paint3);
canvas.translate(150, 0);
canvas.drawPath(path, paint4);
canvas.translate(150, 0);
canvas.drawPath(path, paint5);
canvas.translate(150, 0);
canvas.drawPath(path, paint6);
}

}

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