example :

package test;

import org.mini.apploader.GApplication;
import org.mini.gui.*;
import org.mini.gui.event.GActionListener;

import static org.mini.nanovg.Nanovg.*;

/**
 * @author gust
 */
public class MyApp1 extends GApplication {

    GForm form;

    @Override
    public GForm getForm() {

        if (form != null) {
            return form;
        }

        form = new GForm(null);


        GFrame cframe = new GFrame(form, "drawRegion", 0, 0, 500, 300);
        cframe.getView().add(new GCanvas(form, 0, 0, cframe.getView().getW(), cframe.getView().getH()) {
            GImage gimg = GImage.createImageFromJar("/res/test.png");

            public void paint(GGraphics g) {
                g.setClip(0, 0, this.getWidth(), this.getHeight());
                int imgw = gimg.getWidth();
                int imgh = gimg.getHeight();
                int gx = 120, gy = 120, fw = imgw / 2, fh = imgh / 2;
                g.drawRegion(gimg, fw, fh, fw, fh, GGraphics.TRANS_MIRROR_ROT90, gx, gy, GGraphics.HCENTER | GGraphics.VCENTER);
                g.setColor(0xffff00ff);
                g.drawRect(gx - 2, gy - 2, 5, 5);

                int dx = (int) (this.getW() - 100), dy = 0;
                g.drawImage(gimg, dx, dy, imgw, imgh, GGraphics.LEFT | GGraphics.TOP);
            }
        });
        cframe.setFront(true);
        cframe.setClosable(false);
        cframe.align(NVG_ALIGN_CENTER | NVG_ALIGN_MIDDLE);
        form.add(cframe);
        GButton bt = new GButton(form, "exit", 0, 0, 100, 20);
        form.add(bt);
        bt.setActionListener(new GActionListener() {
            @Override
            public void action(GObject gObject) {
                closeApp();
            }
        });
        return form;
    }
}

drawRegion #16

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