Android中特殊图形的生成例子
浏览数：27 /
时间：2015年06月11日
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.LinearGradient;
import android.graphics.Paint;
import android.graphics.Path;
import android.graphics.PorterDuff;
import android.graphics.PorterDuffXfermode;
import android.graphics.Rect;
import android.graphics.RectF;
import android.graphics.Shader;
import android.graphics.Bitmap.Config;
import android.graphics.Paint.Align;
import android.graphics.PorterDuff.Mode;
import android.graphics.drawable.Drawable;
public class DrawUtil
{
/**
* 画出一个这样一个图形：中间带标题文字的半圆，半圆可以设置阴影和顶部的矩形投影
*
* @param text
* 标题文字 （此处设置为两个字的居中效果）
* @param radio
* 半圆的半径
* @param shadowWidth
* 阴影的宽度
* @param isWithRectf
* 是否有矩形投影
* @param rectfColor
* 矩形投影的颜色
* @param paint
* 画笔对象
* @return
*/
public static Bitmap drawHalfCircleWithText(String text, int radio,
int shadowWidth, boolean isWithRectf, int rectfColor, Paint paint)
{
Bitmap bitmap = Bitmap.createBitmap(radio * 2,
radio * 2 + shadowWidth, Config.ARGB_8888);
Canvas canvas = new Canvas(bitmap);
// 画一个带圆心的扇形，此处为半圆
canvas.drawArc(new RectF(0, 0, radio * 2, radio * 2), 360, 180, true,
paint);
// 是否需要在半圆顶部画出一个矩形投影
if (isWithRectf)
{
paint = reset(paint);
paint.setColor(rectfColor);
Bitmap bmp = drawRectf(radio * 2, radio/8, paint);
paint = reset(paint);
paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC_ATOP));//去掉矩形投影和半圆不相交的部分
canvas.drawBitmap(bmp, 0, radio, paint);
}else
{
LinearGradient lg=new LinearGradient(0,0,0,radio/8,0x44000000,0x00000000,Shader.TileMode.MIRROR);
paint = reset(paint);
paint.setShader(lg);
Bitmap bmp = drawRectf(radio * 2, radio/8, paint);
paint = reset(paint);
paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC_ATOP));//去掉矩形投影和半圆不相交的部分
canvas.drawBitmap(bmp, 0, radio, paint);
}
//在半圆上面画上文字
paint = reset(paint);
paint.setColor(Color.WHITE);
paint.setTextSize(radio * 5 / 12);
paint.setTextAlign(Align.CENTER);
paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC_OVER));
canvas.drawText(text, radio, radio * 5 / 3, paint);
bitmap = Bitmap.createBitmap(bitmap, 0, radio, radio * 2, radio
+ shadowWidth);
return bitmap;
}
/**
* 根据宽度画出一条指定三角形数量的锯齿
*
* @param screenWidth
* 宽度
* @param triangleHeight
* 锯齿的高度
* @param triangleNum
* 三角形的数量
* @param isDown
* 三角形顶点的朝向，true表示向下，false表示向上
* @param paint
* 画笔对象
* @return 返回bitmap对象
*/
public static Bitmap drawtriangle(float screenWidth, float triangleHeight,
int triangleNum, boolean isDown,Paint paint)
{
float triangleWidth = screenWidth / triangleNum;
Bitmap bitmap = Bitmap.createBitmap((int) screenWidth,
(int) triangleHeight, Config.ARGB_8888);
Canvas canvas = new Canvas(bitmap);
Path path = new Path();
if(isDown)
{
path.moveTo(0, 0);
for (int i = 0; i < triangleNum * 2; i++)
{
if (i % 2 == 0)
{
path.lineTo((triangleWidth / 2) * (i + 1), triangleHeight);
} else if (i % 2 == 1)
{
path.lineTo((triangleWidth / 2) * (i + 1), 0);
}
}
}else
{
path.moveTo(0, triangleHeight);
for(int i = 0; i < triangleNum * 2; i++)
{
if(i % 2 == 0)
{
path.lineTo((triangleWidth / 2) * (i + 1), 0);
} else if(i % 2 == 1)
{
path.lineTo((triangleWidth / 2) * (i + 1), triangleHeight);
}
}
}
path.close();
canvas.drawPath(path, paint);
return bitmap;
}
/**
* 画出一条带有指定半圆数量的花边
* @param width 花边的长度
* @param num 半圆的数量
* @param paint 画笔对象
* @return
*/
public static Bitmap drawMultHalfCircle(int width, int num,Paint paint)
{
int radio = (width/num)/2;
Bitmap bitmap = Bitmap.createBitmap(width,
radio, Config.ARGB_8888);
Canvas canvas = new Canvas(bitmap);
for(int i = 0; i < num; i++)
{
canvas.drawBitmap(drawHalfCircle(radio, paint), radio*2*i, 0, paint);
}
return bitmap;
}
/**
* 画一个矩形
* @param width
* @param height
* @param color
* @param paint
* @return
*/
public static Bitmap drawRectf(float width, float height, Paint paint)
{
Bitmap bitmap = Bitmap.createBitmap((int)width, (int)height, Config.ARGB_8888);
Canvas canvas = new Canvas(bitmap);
canvas.drawRect(0, 0, width, height, paint);
return bitmap;
}
/**
* 画出一个半圆
*
* @param radio
* 半径
* @param paint
* @return
*/
public static Bitmap drawHalfCircle(int radio, Paint paint)
{
Bitmap bitmap = Bitmap.createBitmap((int) (radio * 2),
(int) (radio * 2), Config.ARGB_8888);
Canvas canvas = new Canvas(bitmap);
canvas.drawArc(new RectF(0, 0, radio * 2, radio * 2), 360, 180, true,
paint);
bitmap = Bitmap.createBitmap(bitmap, 0, radio, radio * 2, radio);
return bitmap;
}
/**
* 根据图片的短边裁剪成圆形并在周围画上一定宽度的白边
* @param bitmap
* @param ringWidth
* @param radio
* @param paint
* @return
*/
public static Bitmap drawBitmapWithRing(Bitmap bitmap,int ringWidth,Paint paint)
{
Bitmap roundBitmap = toRoundBitmap(bitmap);
int radio = roundBitmap.getWidth() / 2;
Bitmap _bitmap = Bitmap.createBitmap((radio+ringWidth) * 2,
(radio+ringWidth) * 2, Config.ARGB_8888);
Canvas canvas = new Canvas(_bitmap);
canvas.drawCircle((radio+ringWidth), (radio+ringWidth), (radio+ringWidth), paint);
paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC_OVER));
canvas.drawBitmap(roundBitmap, ringWidth, ringWidth, paint);
return _bitmap;
}
/**
* 将图像裁剪成圆形
*
* @param bitmap
* @return
*/
public static Bitmap toRoundBitmap(Bitmap bitmap)
{
if(bitmap == null)
{
return null;
}
int width = bitmap.getWidth();
int height = bitmap.getHeight();
float roundPx;
float left, top, right, bottom, dst_left, dst_top, dst_right, dst_bottom;
if (width <= height)
{
roundPx = width / 2;
top = 0;
bottom = width;
left = 0;
right = width;
height = width;
dst_left = 0;
dst_top = 0;
dst_right = width;
dst_bottom = width;
} else
{
roundPx = height / 2;
float clip = (width - height) / 2;
left = clip;
right = width - clip;
top = 0;
bottom = height;
width = height;
dst_left = 0;
dst_top = 0;
dst_right = height;
dst_bottom = height;
}
Bitmap output = Bitmap.createBitmap(width, height, Config.ARGB_8888);
Canvas canvas = new Canvas(output);
final int color = 0xff424242;
final Paint paint = new Paint();
final Rect src = new Rect((int) left, (int) top, (int) right,
(int) bottom);
final Rect dst = new Rect((int) dst_left, (int) dst_top,
(int) dst_right, (int) dst_bottom);
final RectF rectF = new RectF(dst);
paint.setAntiAlias(true);
canvas.drawARGB(0, 0, 0, 0);
paint.setColor(color);
canvas.drawRoundRect(rectF, roundPx, roundPx, paint);
paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN));
canvas.drawBitmap(bitmap, src, dst, paint);
return output;
}
public static Bitmap darwShadow(Bitmap bitmap,int color,int padding)
{
int width = bitmap.getWidth() + padding;
int height = bitmap.getHeight() + padding;
Bitmap output = Bitmap.createBitmap(width, height, Config.ARGB_8888);
Canvas canvas = new Canvas(output);
Paint paint = new Paint();
paint = reset(paint);
paint.setColor(color);
canvas.drawBitmap(bitmap, padding/2, padding/2, null);
canvas.drawRoundRect(new RectF(0, 0, width, height),padding/2,padding/2,paint);
return output;
}
private static Paint reset(Paint paint)
{
paint.reset();
paint.setAntiAlias(true);
paint.setStyle(Paint.Style.FILL);
return paint;
}
}
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