Image inside a polygon with java2D

Programming Questions

jooora

in Programming Questions • 4 months ago

Hi,

i'd like to display a shape (polygon) with an image inside.

There is the texture function with openGL graphics, but even with smooth(n) the render is too ugly.

The only nice render is the native one (Java2D).

But I didn't find any way to display my image inside a polygon with java2D:

- texture not available

- createshape not available

I tried to make a shape with a whole to hide the part of the image I don't want to show, but I didn't success...

I tried this but even the whole is filled:

Any idea?

Replies(3)

amnon.owed

4 months ago

The alternatives are mask(), the pixel array directly or a PShader.

jooora

4 months ago

Thank you amnon.

For those who want to know the implementation of a solution:

( bgMap is a PImage)

// The background
rect(x, y, w, h);
// Draw the "wholes" in a mask
// 1) create a mask
PGraphics maskPg = createGraphics(bgMap.width, bgMap.height, PConstants.JAVA2D);
maskPg.smooth();
maskPg.beginDraw();
// Fill transparent
maskPg.background(0f);
// "wholes"
maskPg.fill(255f);
maskPg.strokeWeight(10f);
maskPg.stroke(128f);
maskPg.rect(155,350,100,100); // rect whole
maskPg.beginShape(); // custom shape
maskPg.vertex(50,50);
maskPg.vertex(350,50);
maskPg.vertex(250,150);
maskPg.vertex(450,200);
maskPg.vertex(50,150);
maskPg.endShape(CLOSE);
maskPg.endDraw();
bgMap.mask(maskPg); // set the mask to the image
image(bgMap, x, y, w, h); // draw the image

PhiLho

4 months ago

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