android绘制心形_Android 绘制心形

MyLove

package org.wp.activity;

import android.content.Context;

import android.graphics.Canvas;

import android.graphics.Color;

import android.graphics.Paint;

import android.graphics.RectF;

import android.graphics.Typeface;

import android.view.SurfaceHolder;

import android.view.SurfaceView;

/**

* ================================================

* setTypeface

* ================================================

* public Typeface setTypeface (Typeface typeface)

* Since: API Level 1 Set or clear the typeface object.

* Pass null to clear any previous typeface.

* As a convenience, the parameter passed is also returned.

*

* Parameters

* typeface May be null. The typeface to be installed in the paint

* Returns

* typeface

*

*

* ================================================

* create

* ================================================

* public static Typeface create (Typeface family, int style)

* Since: API Level 1 Create a typeface object that best matches

* the specified existing typeface and the specified Style.

* Use this call if you want to pick a new style from the same family

* of an existing typeface object.

* If family is null, this selects from the default font's family.

*

* Parameters

* family May be null. The name of the existing type face.

* style The style (normal, bold, italic) of the typeface.

* e.g. NORMAL, BOLD, ITALIC, BOLD_ITALIC

* Returns

* The best matching typeface.

*

* Typeface.create(Typeface family, int style)

* 创建一个混合型新的字体：有4*5种搭配

*

* Typeface类型

* DEFAULT 默认字体

* DEFAULT_BOLD 默认粗体

* MONOSPACE 单间隔字体

* SANS_SERIF 单间隔字体

* SERIF 衬线字体

*

* int Style类型

* BOLD 粗体

* BOLD_ITALIC 粗斜体

* ITALIC 斜体

* NORMAL 普通字体

*

*

* ================================================

* drawRoundRect 画一个圆角矩形

* ================================================

* public void drawRoundRect (RectF rect, float rx, float ry, Paint paint)

* Since: API Level 1 Draw the specified round-rect using the specified paint.

* The roundrect will be filled or framed based on the Style in the paint.

* Parameters

* rect The rectangular bounds of the roundRect to be drawn

* rx The x-radius of the oval used to round the corners

* ry The y-radius of the oval used to round the corners

* paint The paint used to draw the roundRect

*

* @author wp

*

*/

public class MyLove extends SurfaceView implements SurfaceHolder.Callback,

Runnable {

private SurfaceHolder sfh = null;

private Paint paint = null;

private Canvas canvas = null;

private int SH = 0, SW = 0;

private int miCount = 0;

private boolean loop = false;

public MyLove(Context context) {

super(context);

this.setKeepScreenOn(true);

this.setFocusable(true);

sfh = this.getHolder();

sfh.addCallback(this);

paint = new Paint();

paint.setAntiAlias(true);

paint.setTextSize(32);

paint.setTypeface(Typeface.create(Typeface.SERIF, Typeface.ITALIC));

loop = true;

}

@Override

public void surfaceCreated(SurfaceHolder holder) {

SW = getWidth();

SH = getHeight();

new Thread(this).start();

}

@Override

public void surfaceChanged(SurfaceHolder holder, int format, int width,

int height) {

}

@Override

public void surfaceDestroyed(SurfaceHolder holder) {

loop = false;

}

@Override

public void run() {

while (loop) {

try {

Thread.sleep(300);

} catch (Exception e) {

e.printStackTrace();

}

/*

* synchronized 关键字,代表这个方法加锁

* 相当于不管哪一个线程A每次运行到这个方法时,

* 都要检查有没有其它正在用这个方法的线程B(或者C D等)

*

* 有的话要等正在使用这个方法的线程B(或者C D)

* 运行完这个方法后再运行此线程A,

*

* 没有的话,直接运行

*

* 它包括两种用法：synchronized 方法和 synchronized 块。

*/

synchronized (sfh) {

draw();

}

}

}

private void draw() {

canvas = sfh.lockCanvas();

try {

if (canvas == null)

return;

/** 刷屏 **/

paint.setColor(Color.BLACK);

canvas.drawRect(0, 0, SW, SH, paint);

/** 变换画笔的颜色 **/

if (miCount < 100) {

miCount++;

} else {

miCount = 0;

}

switch (miCount % 6) {

case 0:

paint.setColor(Color.BLUE);

break;

case 1:

paint.setColor(Color.GREEN);

break;

case 2:

paint.setColor(Color.RED);

break;

case 3:

paint.setColor(Color.YELLOW);

break;

case 4:

paint.setColor(Color.argb(255, 255, 181, 216));

break;

case 5:

paint.setColor(Color.argb(255, 0, 255, 255));

break;

default:

paint.setColor(Color.WHITE);

break;

}

/** 画一个心 **/

int i, j;

double x, y, r;

for (i = 0; i <= 90; i++) {

for (j = 0; j <= 90; j++) {

r = Math.PI / 45 * i * (1 - Math.sin(Math.PI / 45 * j))

* 20;

x = r * Math.cos(Math.PI / 45 * j)

* Math.sin(Math.PI / 45 * i) + 320 / 2;

y = -r * Math.sin(Math.PI / 45 * j) + 400 / 4;

canvas.drawPoint((float) x, (float) y, paint);

}

}

/** 绘制文字 **/

canvas.drawText("Loving You", 75, 400, paint);

/** 绘制圆角矩形 **/

RectF rect = new RectF(60, 403, 260, 408);

canvas.drawRoundRect(rect, (float) 1.0, (float) 1.0, paint);

sfh.unlockCanvasAndPost(canvas);

} catch (Exception e) {

e.printStackTrace();

}

}

}

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2011-09-06 15:18

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