incorrent affine transform on IOS

[ddyer0]

The attached program rotates an arrowhead pointing AWAY from a fixed point
near the center of the screen. - on the simulator and on android. However,
on IOS it rotates the arrowhead with the point touching a fixed point near
the center of the screen.

''''java

package com.boardspace.dtest;

// issue #2555
// this version shows that g.rotate damages the transform after a
// few iterations, and that the damage persists across calls to paint
// sep 23 2018
//
import com.codename1.ui.Display;
import com.codename1.ui.Form;
import com.codename1.ui.Label;
import com.codename1.ui.Stroke;
import com.codename1.ui.geom.GeneralPath;
import com.codename1.ui.geom.Rectangle;
import com.codename1.ui.plaf.UIManager;
import com.codename1.ui.util.Resources;
import com.codename1.ui.Graphics;
import com.codename1.ui.layouts.BorderLayout;

class Polygon
{
GeneralPath path = new GeneralPath();
public Polygon() { }
public void addPoint(int x,int y)
{ if(path.getCurrentPoint()==null)
{ path.moveTo(x,y); }
else { path.lineTo(x,y); }
}
public void fill(Graphics g)
{
g.fillShape(path);
}
public void frame(Graphics g)
{
Stroke stroke = new Stroke(
1,
Stroke.CAP_BUTT,
Stroke.JOIN_ROUND, 1f
);

	// Draw the shape
    g.drawShape(path, stroke);
	
}
public Rectangle getBounds() {
	return(path.getBounds());
}
public boolean contains(int i, int j) { return(path.getBounds().contains(i,j)); }

}

public class Dtest {

private Form current;
@SuppressWarnings("unused")
private Resources theme;

public void init(Object context) {
theme = UIManager.initFirstTheme("/theme");
// Pro only feature, uncomment if you have a pro subscription
// Log.bindCrashProtection(true);
}
int loops = 0;
public void start() {
if(current != null){
current.show();
}
Form hi = new Form("Hi >>0 World");
current = hi;
hi.setLayout(new BorderLayout());
hi.addComponent(BorderLayout.CENTER, new Label("Hi Overlay World 2") {
int paints = 0;
@OverRide
public void paint(Graphics g) {
paints++;
Polygon p = new Polygon();
p.addPoint(-100, 0);
p.addPoint(0, -100);
p.addPoint(100, 0);
p.addPoint(-100,0);

      	int w = getWidth();
    	int h = getHeight();
     	g.setColor(0x8f8f9f7f);
    	g.fillRect(0,0,w,h);
    	g.setColor(0);
       	g.drawString("Paint "+paints,100,100);

    	g.rotateRadians(((float)Math.PI+paints),w/2,w/4);

    	g.setColor(0xffffff);
       	g.drawRect(w/2-100, h/2-200, 200, 100);
    	g.setColor(0);
    	g.translate(w/2, h/2-100);
    	p.fill(g);			// triangle should be inscribed in the rectangle    
    	g.setColor(0xff00);
    	p.frame(g);
       	g.translate(-w/2, -(h/2-100));
  	
      		
       	g.rotateRadians(-((float)Math.PI+paints),w/2,w/4);
                }
    
});
hi.show();
Runnable rr = new Runnable (){ 
	public void run() {
		System.out.println("running");
	while(true) 
	{ 
	  hi.repaint();
	  try {
		  Thread.sleep(1000); 
		  }
	  
	  catch (InterruptedException e) {};
	}}};
new Thread(rr).start();

}
public void stop() {
current = Display.getInstance().getCurrent();
}

public void destroy() {
}
}
''''

[ddyer0]

please keep this issue in mind as you look into the other clipping/rotating problem. I have an actual app affected by this, in a way that would be quite difficult to work around.

[ddyer0]

This is probably part of the same can of worms. Consider these two screen snaps from IOS. The first, correct one, is drawn using to a graphics object derived from image.getGraphics(), the second, incorrect one, is drawn directly to a graphics object supplied to paint(Graphics g)

The drawing code in both cases is the same; only the source of the graphics object differs.
In this case, the filled, curved lines are drawn using polygons defined by com.codename1.ui.geom.GeneralPath

[nickhowes99]

I'm also seeing problems with rotation Transforms and only on iOS.
Most of the drawing in my app is done via GeneralPaths and some of these have transforms applied (path.transform(...)) which works in the simulator and on Android, but sometimes fails on iOS - typically if there are "too many" transforms used in the various GeneralPaths that are being rendered (where "too many" is not a consistent count). A couple of example screenshots are attached. The first is a pure Java App, the second is CN1 on iOS. The arrow at the bottom middle should be pointing down, but the rotation transform in CN1 failed for some reason.

[shai-almog]

Not sure if it's fixed but as we're landing a metal pipeline we need to retest all graphics issues: #4799

[ddyer0]

this is closer to working, but not quite. In landscape mode, the frame seems to think it is in portait mode;
the frame title is rendered on the left instead of the top. the text of the frame counter
is rendered in a tiny font, and the pivot point of the animation isn't correct.

[shai-almog]

We're working on this as part of #4875