用JAVA語言寫一個二維平面圖形(如長方形)的平移,旋轉,縮放的程序.

import?javax.swing.*;

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import?java.awt.*;

import?java.awt.event.ActionEvent;

import?java.awt.geom.*;

/**

*?@author?Hardneedl

*/

class?RectTransform?extends?JFrame?{

private?static?final?Dimension?minSize?=?new?Dimension(300,?200);

private?static?final?Dimension?maxSize?=?new?Dimension(1024,?768);

private?static?final?Dimension?preferredSize?=?new?Dimension(600,?400);

public?Dimension?getMaximumSize()?{return?maxSize;}

public?Dimension?getMinimumSize()?{return?minSize;}

public?Dimension?getPreferredSize()?{return?preferredSize;}

public?String?getTitle()?{return?"Frame?Title";}

private?AffineTransform?af?=?new?AffineTransform();

private?Stroke?stroke?=?new?BasicStroke(2.0f);

private?Rectangle?rct?=?new?Rectangle(40,140,200,140);

private?JComponent?canvas?=?new?JComponent(){

protected?void?paintComponent(Graphics?g)?{

super.paintComponent(g);

g.setColor(Color.BLACK);

g.fillRect(0,0,getWidth(),getHeight());

Graphics2D?g2d?=?(Graphics2D)g.create();

g2d.setColor(Color.YELLOW);

g2d.setTransform(af);

g2d.setStroke(stroke);

g2d.draw(rct);

g2d.dispose();

}

};

RectTransform()?throws?HeadlessException?{

init();

doLay();

attachListeners();

}

private?void?init()?{

}

private?void?doLay()?{

Container?container?=?getContentPane();

JPanel?panel?=?new?JPanel(new?FlowLayout(FlowLayout.CENTER,30,5));

panel.add(new?JButton(?new?AfAction("move",?AffineTransform.getTranslateInstance(100,100))?));

panel.add(new?JButton(?new?AfAction("rotate",?AffineTransform.getRotateInstance(Math.PI/3,40,120)?)?));

panel.add(new?JButton(?new?AfAction("zoomIn",?AffineTransform.getScaleInstance(2,2))?));

panel.add(new?JButton(?new?AfAction("ZoomOut",?AffineTransform.getScaleInstance(.5d,.5d))?));

panel.add(new?JButton(?new?AfAction("Original",?new?AffineTransform())?)?);

container.add(panel,BorderLayout.NORTH);

container.add(canvas,BorderLayout.CENTER);

pack();

}

private?void?attachListeners()?{

setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

}

private?class?AfAction?extends?AbstractAction?{

private?AffineTransform?aff;

private?AfAction(String?n,AffineTransform?af)?{

super(n);

this.aff?=?af;

}

public?void?actionPerformed(ActionEvent?e)?{

af.setTransform(aff);

if(canvas.isVisible())?canvas.paintImmediately(0,0,getWidth(),getHeight());

}

}

public?static?void?main(String[]?args)?{

new?RectTransform().setVisible(true);

}

}

用java怎樣編寫一個二維坐標平移程序

java編寫二維坐標平移程序，主要是通過類繼承Point2D,使用里面的方法來平移，如下代碼：

class??Point2D

{???

int?x,?y;

Point2D(){??}

Point2D(int?i,int?j)

{

x=i;

y=j;

}

void?offset(int?a,?int?b)

{

x=x+a;

y=y+b;

}

void?distance(Point2D?a,Point2D?b)?

{

float?m;

m=(float)Math.sqrt((a.x-b.x)*(a.x-b.x)+(a.y-b.y)*(a.y-b.y));

System.out.print("二維空間兩點之間的距離:");

System.out.println("m="+m);

}

}

public?class?Point3D?extends?Point2D

{

int?x,y,z;

Point3D(int?x,int?y,int?z)

{

this.x=x;

this.y=y;

this.z=z;

}

Point3D(Point2D?p,int?z)

{

x=p.x;

y=p.y;

this.z=z;

}

void?offset(int?a,?int?b,int?c)

{

x=x+a;

b=x+b;

c=x+c;

}?

void?distance(Point3D?a,Point3D?b)?

{

float?n;

n=(float)Math.sqrt((a.x-b.x)*(a.x-b.x)+(a.y-b.y)*(a.y-b.y)+(a.y-b.y)*(a.y-b.y));//計算兩點之間的距離。

System.out.print("三維空間兩點之間的距離:");

System.out.println("n="+n);

}

public?static?void?main(String[]?args)?

{

Point2D?p2d1=new?Point2D(2,3);

Point2D?p2d2=new?Point2D(3,6);

Point3D?p2d3=new?Point3D(1,2,3);

Point3D?p2d4=new?Point3D(p2d1,3);

p2d1.distance(p2d1,p2d2);

p2d3.distance(p2d3,p2d4);//平移一段距離。

}

}

Android如何純java代碼實現字體陰影效果

Android實現純java代碼字體陰影效果，主要是通過activity的draw方法，進行重新繪制，如下代碼：

package?canvas.test;

import?android.app.Activity;

import?android.os.Bundle;

import?android.content.Context;

import?android.graphics.Bitmap;

import?android.graphics.BitmapFactory;

import?android.graphics.Canvas;

import?android.graphics.Color;

import?android.graphics.Paint;

import?android.graphics.PorterDuff;

import?android.graphics.PorterDuff.Mode;

import?android.graphics.PorterDuffXfermode;

import?android.graphics.Rect;

import?android.graphics.RectF;

import?android.graphics.drawable.Drawable;

import?android.view.View;

public?class?ShaderEffect?extends?Activity?{

@Override

public?void?onCreate(Bundle?savedInstanceState)?{

super.onCreate(savedInstanceState);

setContentView(new?ImageEffect(this));

}

class?ImageEffect?extends?View{

Paint?paint;?

public?ImageEffect?(Context?context){

super(context);

paint?=?new?Paint();//初始化畫筆，為后面陰影效果使用。

paint.setAntiAlias(true);//去除鋸齒。

paint.setShadowLayer(5f,?5.0f,?5.0f,?Color.BLACK);//設置陰影層，這是關鍵。

paint.setXfermode(new?PorterDuffXfermode(Mode.SRC_IN));

}

@Override

public?void?onDraw(Canvas?canvas){

super.onDraw(canvas);

int?posX?=?20;

int?posY?=?50;

int?PicWidth,PicHegiht;?

Drawable?drawable?=?getResources().getDrawable(R.drawable.button);

Drawable?dbe?=?getResources().getDrawable(R.drawable.button).mutate();//如果不調用mutate方法，則原圖也會被改變，因為調用的資源是同一個，所有對象是共享狀態的。

Drawable?drawTest?=?getResources().getDrawable(R.drawable.button);

Bitmap?bmp?=?BitmapFactory.decodeResource(getResources(),?R.drawable.button);

PicWidth?=?drawable.getIntrinsicWidth();

PicHegiht?=?drawable.getIntrinsicHeight();

drawTest.setBounds(posX,?(2?*?posY)?+?PicHegiht,?posX?+?PicWidth,?(2?*?posY)?+?2?*?PicHegiht?);

drawable.setBounds(posX,posY,posX+PicWidth,posY+PicHegiht);

dbe.setBounds(0,?0,?PicWidth,?PicHegiht);

canvas.drawColor(Color.WHITE);//設置畫布顏色

canvas.save(Canvas.MATRIX_SAVE_FLAG);

dbe.setColorFilter(0x7f000000,PorterDuff.Mode.SRC_IN);

canvas.translate(posX?+?(int)(0.9?*?PicWidth/2),?posY?+?PicHegiht/2);//圖像平移為了剛好在原圖后形成影子效果。

canvas.skew(-0.9F,?0.0F);//圖像傾斜效果。

canvas.scale(1.0f,?0.5f);//圖像（其實是畫布）縮放，Y方向縮小為1/2。

dbe.draw(canvas);//此處為畫原圖像影子效果圖，比原圖先畫，則會在下層。

drawable.clearColorFilter();

canvas.restore();

canvas.save(Canvas.MATRIX_SAVE_FLAG);

drawable.draw(canvas);//此處為畫原圖像，由于canvas有層次效果，因此會蓋在影子之上。

canvas.restore();

//默認無效果原圖

canvas.save(Canvas.MATRIX_SAVE_FLAG);

drawTest.draw(canvas);

canvas.restore();

//圖片陰影效果

canvas.save(Canvas.MATRIX_SAVE_FLAG);

//Rect?rect?=?new?Rect(2*posX?+?PicWidth,?2*posY?+?PicHegiht,?2*posX?+?2*PicWidth,?2*posY?+?2*PicHegiht);//此為理論上的陰影圖坐標

Rect?rect?=?new?Rect(2*posX?+?PicWidth?+?3,?2*posY?+?PicHegiht?+?3,?2*posX?+?2*PicWidth?-?2,?2*posY?+?2*PicHegiht?-?2);

//由于圖片的實際尺寸比顯示出來的圖像要大一些，因此需要適當更改下大小，以達到較好的效果

RectF?rectF?=?new?RectF(rect);

canvas.drawRoundRect(rectF,?10f,?10f,?paint);//在原有矩形基礎上，畫成圓角矩形，同時帶有陰影層。

canvas.drawBitmap(bmp,?2*posX?+?PicWidth,?2*posY?+?PicHegiht,?null);//畫上原圖。

canvas.restore();

}

}

}

網頁名稱：圖像平移的java代碼 圖像平移的java代碼有哪些
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