tsparticles-engine/browser/Utils/CanvasUtils.js

Easily create highly customizable particle, confetti and fireworks animations and use them as animated backgrounds for your website. Ready to use components available also for React, Vue.js (2.x and 3.x), Angular, Svelte, jQuery, Preact, Riot.js, Inferno.

import { getStyleFromRgb } from "./ColorUtils";
export function drawLine(context, begin, end) {
    context.beginPath();
    context.moveTo(begin.x, begin.y);
    context.lineTo(end.x, end.y);
    context.closePath();
}
export function drawTriangle(context, p1, p2, p3) {
    context.beginPath();
    context.moveTo(p1.x, p1.y);
    context.lineTo(p2.x, p2.y);
    context.lineTo(p3.x, p3.y);
    context.closePath();
}
export function paintBase(context, dimension, baseColor) {
    context.fillStyle = baseColor ?? "rgba(0,0,0,0)";
    context.fillRect(0, 0, dimension.width, dimension.height);
}
export function paintImage(context, dimension, image, opacity) {
    if (!image) {
        return;
    }
    context.globalAlpha = opacity;
    context.drawImage(image, 0, 0, dimension.width, dimension.height);
    context.globalAlpha = 1;
}
export function clear(context, dimension) {
    context.clearRect(0, 0, dimension.width, dimension.height);
}
export function drawParticle(data) {
    const { container, context, particle, delta, colorStyles, backgroundMask, composite, radius, opacity, shadow, transform, } = data;
    const pos = particle.getPosition(), angle = particle.rotation + (particle.pathRotation ? particle.velocity.angle : 0), rotateData = {
        sin: Math.sin(angle),
        cos: Math.cos(angle),
    }, transformData = {
        a: rotateData.cos * (transform.a ?? 1),
        b: rotateData.sin * (transform.b ?? 1),
        c: -rotateData.sin * (transform.c ?? 1),
        d: rotateData.cos * (transform.d ?? 1),
    };
    context.setTransform(transformData.a, transformData.b, transformData.c, transformData.d, pos.x, pos.y);
    context.beginPath();
    if (backgroundMask) {
        context.globalCompositeOperation = composite;
    }
    const shadowColor = particle.shadowColor;
    if (shadow.enable && shadowColor) {
        context.shadowBlur = shadow.blur;
        context.shadowColor = getStyleFromRgb(shadowColor);
        context.shadowOffsetX = shadow.offset.x;
        context.shadowOffsetY = shadow.offset.y;
    }
    if (colorStyles.fill) {
        context.fillStyle = colorStyles.fill;
    }
    const strokeWidth = particle.strokeWidth ?? 0;
    context.lineWidth = strokeWidth;
    if (colorStyles.stroke) {
        context.strokeStyle = colorStyles.stroke;
    }
    drawShape(container, context, particle, radius, opacity, delta);
    if (strokeWidth > 0) {
        context.stroke();
    }
    if (particle.close) {
        context.closePath();
    }
    if (particle.fill) {
        context.fill();
    }
    drawShapeAfterEffect(container, context, particle, radius, opacity, delta);
    context.globalCompositeOperation = "source-over";
    context.setTransform(1, 0, 0, 1, 0, 0);
}
export function drawShape(container, context, particle, radius, opacity, delta) {
    if (!particle.shape) {
        return;
    }
    const drawer = container.drawers.get(particle.shape);
    if (!drawer) {
        return;
    }
    drawer.draw(context, particle, radius, opacity, delta, container.retina.pixelRatio);
}
export function drawShapeAfterEffect(container, context, particle, radius, opacity, delta) {
    if (!particle.shape) {
        return;
    }
    const drawer = container.drawers.get(particle.shape);
    if (!drawer || !drawer.afterEffect) {
        return;
    }
    drawer.afterEffect(context, particle, radius, opacity, delta, container.retina.pixelRatio);
}
export function drawPlugin(context, plugin, delta) {
    if (!plugin.draw) {
        return;
    }
    plugin.draw(context, delta);
}
export function drawParticlePlugin(context, plugin, particle, delta) {
    if (!plugin.drawParticle) {
        return;
    }
    plugin.drawParticle(context, particle, delta);
}
export function alterHsl(color, type, value) {
    return {
        h: color.h,
        s: color.s,
        l: color.l + (type === "darken" ? -1 : 1) * value,
    };
}