使用libgdx裁剪图像 [英] crop image using libgdx
本文介绍了使用libgdx裁剪图像的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我需要像这样裁剪图像
I need to crop image like this
我需要从中心绘制部分图像
I need to draw partial image from center
我知道有很多参数的批处理的draw()方法,但是没有关于所有这些参数的好的文档,所以我不知道如何使用它.
I know there is draw() method of batch with a lot of params, but there is no good documentation about all this params, so i can't figure out how to use it.
这是我实现的:
public class TexturePart {
Texture tex;
Vector2 position;
// Target Dimension of image
int targetWidth;
int targetHeight;
// Src Dimensions of Image
int srcWidth;
int srcHeight;
int srcX;
int srcY;
// Ratio of dimension of target and source
float srcTargetRatioX;
float srcTargetRatioY;
// ImagePart variables with values between 0-100 to draw part of image
int startPercentX;
int endPercentX;
int startPercentY;
int endPercentY;
int clipWidth;
int clipHeight;
int clipSrcWidth;
int clipSrcHeight;
public TexturePart(TextureRegion reg, float x, float y) {
tex = reg.getTexture();
position = new Vector2(x, y);
srcX = reg.getRegionX();
srcY = reg.getRegionY();
srcWidth = reg.getRegionWidth();
srcHeight = reg.getRegionHeight();
clipSrcWidth = srcWidth;
clipSrcHeight = srcHeight;
startPercentX = 28;
startPercentY = 28;
endPercentX = 72;
endPercentY = 72;
SetTargetDimension(srcWidth, srcHeight);
}
public void setSrcWidthHeight(int width, int height){
this.srcWidth=width;
this.srcHeight=height;
}
public void setSrcHeight(int height){
this.srcHeight=height;
}
public void SetTargetDimension(int targetWidth, int targetHeight) {
this.targetWidth = targetWidth;
this.targetHeight = targetHeight;
clipWidth = targetWidth;
clipHeight = targetHeight;
srcTargetRatioX = (float) targetWidth / (float) srcWidth;
srcTargetRatioY = (float) targetHeight / (float) srcHeight;
}
public void SetStart(int x, int y) {
startPercentX = x;
startPercentY = y;
}
public void SetEnd(int x, int y) {
endPercentX = x;
endPercentY = y;
}
public void Draw(SpriteBatch sp) {
clipSrcWidth = (int) (Math.abs(startPercentX - endPercentX) / 100f * srcWidth);
clipSrcHeight = (int) (Math.abs(startPercentX - endPercentY) / 100f * srcHeight);
int startX = clipWidth/2 + (int) ((float) startPercentX / 100f * (float) srcX);
int startY = clipHeight/2 + (int) ((float) startPercentY / 100f * (float) srcY);
clipWidth = (int) (srcTargetRatioX * clipSrcWidth);
clipHeight = (int) (srcTargetRatioY * clipSrcHeight);
sp.begin();
float scaleX=targetWidth/(srcWidth+0.f);
float scaleY=targetHeight/(srcHeight+0.f);
sp.draw(tex, 0, 0, srcWidth, srcHeight, srcWidth, srcHeight, 1, 1, 0, startX, startY, clipSrcWidth, clipSrcHeight, false, false);
//sp.draw(tex, 0,0,clipWidth, clipHeight, clipWidth, clipHeight, clipSrcWidth, clipSrcHeight, false, false);
sp.end();
}
但是它没有按预期工作
推荐答案
要裁剪纹理,您只需使用TextureRegion
To crop the texture you just need to use TextureRegion
TextureRegion(Texture texture, int x, int y, int width, int height)
在您的情况下,其外观应为:
in your case it should look like:
Texture texture; //this is your original image
...
TextureRegion region = new TextureRegion(texture, texture.getWidth()*0.28f, 0, texture.getWidth()*0.44f, texture.getHeight() );
...
//now you can just draw your texture region
sp.draw(region); //you can also use other versions of draw to set region position on screen and so on
为什么我将 x 设置为 texture.getWidth()* 0.28f ?因为如果要居中放置,它的左边界应为原始纹理宽度-纹理区域宽度的50%.
Why i set x as texture.getWidth()*0.28f? Because if want it centered it should have left margin = 50% of original texture width - texture region width.
(1 - 0.44) / 2 = 0.28
这篇关于使用libgdx裁剪图像的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!
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