@asoftwareworld/form-builder
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ASW Form Builder helps you with rapid development and designed web forms which includes several controls. The key feature of Form Builder is to make your content attractive and effective. We can customize our control at run time and preview the same befor
79 lines • 12.8 kB
JavaScript
/**
* @license
* Copyright ASW (A Software World) All Rights Reserved.
*
* Use of this source code is governed by an MIT-style license that can be
* found in the LICENSE file
*/
export function resizeCanvas(canvas, width, height) {
const WIDTH_SOURCE = canvas.width;
const HEIGHT_SOURCE = canvas.height;
width = Math.round(width);
height = Math.round(height);
const RATIO_W = WIDTH_SOURCE / width;
const RATIO_H = HEIGHT_SOURCE / height;
const RATIO_W_HALF = Math.ceil(RATIO_W / 2);
const RATIO_H_HALF = Math.ceil(RATIO_H / 2);
const ctx = canvas.getContext('2d');
if (ctx) {
const img = ctx.getImageData(0, 0, WIDTH_SOURCE, HEIGHT_SOURCE);
const img2 = ctx.createImageData(width, height);
const data = img.data;
const data2 = img2.data;
for (let j = 0; j < height; j++) {
for (let i = 0; i < width; i++) {
const x2 = (i + j * width) * 4;
const CENTER_Y = j * RATIO_H;
let weight = 0;
let weights = 0;
let WEIGHTS_ALPHA = 0;
let GX_R = 0;
let GX_G = 0;
let GX_B = 0;
let GX_A = 0;
const XX_START = Math.floor(i * RATIO_W);
const YY_START = Math.floor(j * RATIO_H);
let XX_STOP = Math.ceil((i + 1) * RATIO_W);
let YY_STOP = Math.ceil((j + 1) * RATIO_H);
XX_STOP = Math.min(XX_STOP, WIDTH_SOURCE);
YY_STOP = Math.min(YY_STOP, HEIGHT_SOURCE);
for (let yy = YY_START; yy < YY_STOP; yy++) {
const dy = Math.abs(CENTER_Y - yy) / RATIO_H_HALF;
const CENTER_X = i * RATIO_W;
const w0 = dy * dy; // pre-calc part of w
for (let xx = XX_START; xx < XX_STOP; xx++) {
const dx = Math.abs(CENTER_X - xx) / RATIO_W_HALF;
const w = Math.sqrt(w0 + dx * dx);
if (w >= 1) {
// pixel too far
continue;
}
// hermite filter
weight = 2 * w * w * w - 3 * w * w + 1;
const POS_X = 4 * (xx + yy * WIDTH_SOURCE);
// alpha
GX_A += weight * data[POS_X + 3];
WEIGHTS_ALPHA += weight;
// colors
if (data[POS_X + 3] < 255) {
weight = weight * data[POS_X + 3] / 250;
}
GX_R += weight * data[POS_X];
GX_G += weight * data[POS_X + 1];
GX_B += weight * data[POS_X + 2];
weights += weight;
}
}
data2[x2] = GX_R / weights;
data2[x2 + 1] = GX_G / weights;
data2[x2 + 2] = GX_B / weights;
data2[x2 + 3] = GX_A / WEIGHTS_ALPHA;
}
}
canvas.width = width;
canvas.height = height;
// draw
ctx.putImageData(img2, 0, 0);
}
}
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j < height; j++) {\r\n            for (let i = 0; i < width; i++) {\r\n                const x2 = (i + j * width) * 4;\r\n                const CENTER_Y = j * RATIO_H;\r\n                let weight = 0;\r\n                let weights = 0;\r\n                let WEIGHTS_ALPHA = 0;\r\n                let GX_R = 0;\r\n                let GX_G = 0;\r\n                let GX_B = 0;\r\n                let GX_A = 0;\r\n\r\n                const XX_START = Math.floor(i * RATIO_W);\r\n                const YY_START = Math.floor(j * RATIO_H);\r\n                let XX_STOP = Math.ceil((i + 1) * RATIO_W);\r\n                let YY_STOP = Math.ceil((j + 1) * RATIO_H);\r\n                XX_STOP = Math.min(XX_STOP, WIDTH_SOURCE);\r\n                YY_STOP = Math.min(YY_STOP, HEIGHT_SOURCE);\r\n\r\n                for (let yy = YY_START; yy < YY_STOP; yy++) {\r\n                    const dy = Math.abs(CENTER_Y - yy) / RATIO_H_HALF;\r\n                    const CENTER_X = i * RATIO_W;\r\n                    const w0 = dy * dy; // pre-calc part of w\r\n                    for (let xx = XX_START; xx < XX_STOP; xx++) {\r\n                        const dx = Math.abs(CENTER_X - xx) / RATIO_W_HALF;\r\n                        const w = Math.sqrt(w0 + dx * dx);\r\n                        if (w >= 1) {\r\n                            // pixel too far\r\n                            continue;\r\n                        }\r\n                        // hermite filter\r\n                        weight = 2 * w * w * w - 3 * w * w + 1;\r\n                        const POS_X = 4 * (xx + yy * WIDTH_SOURCE);\r\n                        // alpha\r\n                        GX_A += weight * data[POS_X + 3];\r\n                        WEIGHTS_ALPHA += weight;\r\n                        // colors\r\n                        if (data[POS_X + 3] < 255) {\r\n                            weight = weight * data[POS_X + 3] / 250;\r\n                        }\r\n                        GX_R += weight * data[POS_X];\r\n                        GX_G += weight * data[POS_X + 1];\r\n                        GX_B += weight * data[POS_X + 2];\r\n                        weights += weight;\r\n                    }\r\n                }\r\n                data2[x2] = GX_R / weights;\r\n                data2[x2 + 1] = GX_G / weights;\r\n                data2[x2 + 2] = GX_B / weights;\r\n                data2[x2 + 3] = GX_A / WEIGHTS_ALPHA;\r\n            }\r\n        }\r\n\r\n\r\n        canvas.width = width;\r\n        canvas.height = height;\r\n\r\n        // draw\r\n        ctx.putImageData(img2, 0, 0);\r\n    }\r\n}\r\n"]}