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Extends p5.Image to handle nearest neighbor resizing for scaling images w/o blurring.
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| /** | |
| * Resize the image to a new width and height using nearest neigbor algorithm. To make the image scale | |
| * proportionally, use 0 as the value for the wide or high parameter. | |
| * For instance, to make the width of an image 150 pixels, and change | |
| * the height using the same proportion, use resize(150, 0). | |
| * | |
| **** Note: Disproportionate resizing squashes the "pixels" from squares to rectangles. | |
| */ | |
| p5.Image.prototype.resizeNN = function(width, height) { | |
| if (width === 0 && height === 0) { | |
| width = this.canvas.width; | |
| height = this.canvas.height; | |
| } else if (width === 0) { | |
| width = this.canvas.width * height / this.canvas.height; | |
| } else if (height === 0) { | |
| height = this.canvas.height * width / this.canvas.width; | |
| } | |
| width = Math.floor(width); | |
| height = Math.floor(height); | |
| var temp = createImage(width,height), | |
| wScale = width / this.width , | |
| hScale = height / this.height | |
| this.loadPixels() | |
| temp.loadPixels() | |
| for(var x=0; x<temp.width; x++) { | |
| for(var y=0; y<temp.height; y++) { | |
| // var ind = 4*(y*img.width + x) | |
| var sourceP = this.get(1.0*x/wScale, 1.0*y/hScale) | |
| temp.set(x,y,sourceP) | |
| } | |
| } | |
| temp.updatePixels() | |
| this.updatePixels() | |
| this.canvas.width = this.width = width; | |
| this.canvas.height = this.height = height; | |
| console.log(temp) | |
| this.drawingContext.drawImage(temp.canvas, | |
| 0, 0, width, height, | |
| 0, 0, width, height | |
| ); | |
| }; |
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