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Restructure #7

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a0b87c1
improve: restructure everything using cursor
FelixAbrahamsson Apr 7, 2025
b0d2011
feature: support setTransform and rotate
FelixAbrahamsson Apr 7, 2025
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88 changes: 85 additions & 3 deletions example/example.js
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Original file line number Diff line number Diff line change
@@ -1,15 +1,21 @@
import { far } from "../src/index.js";

function getReferenceContext2d(element, transform) {
const context = element.getContext("2d");
// Reset transform first
context.resetTransform();
// Then apply in same order: scale, rotate, translate
context.scale(transform.scale, transform.scale);
if (transform.rotation) {
context.rotate(transform.rotation);
}
context.translate(transform.x, transform.y);

return context;
}

function getFarContext2d(element, transform) {
const context = far.far(element, transform).getContext("2d");

return context;
return far(element, transform).getContext("2d");
}

const referenceCanvas = document.getElementById("reference");
Expand Down Expand Up @@ -70,6 +76,12 @@ const contextFar = getFarContext2d(document.getElementById("far"), {

image.data.onload = function () {
function render(ctx) {
// Clear the canvas first
ctx.save();
ctx.resetTransform();
ctx.clearRect(0, 0, canvasDimensions.width, canvasDimensions.height);
ctx.restore();

images.forEach((image, i) => {
ctx.save();

Expand Down Expand Up @@ -123,10 +135,80 @@ image.data.onload = function () {

ctx.restore();
});
// Draw transform tests last (at the top of canvas)
testTransforms(ctx);
}

// Run rendering
render(contextReference);
render(contextFar);
};
image.data.src =
"https://upload.wikimedia.org/wikipedia/commons/thumb/e/e3/Saturn_from_Cassini_Orbiter_%282004-10-06%29.jpg/320px-Saturn_from_Cassini_Orbiter_%282004-10-06%29.jpg";

// Test transform operations
function testTransforms(ctx) {
// Save current state before switching to screen space
ctx.save();
ctx.resetTransform();

// Clear the test area
ctx.fillStyle = "#EEE";
ctx.fillRect(0, 0, 400, 200);

// Draw a grid for reference
ctx.strokeStyle = "#CCC";
for (let x = 0; x <= 400; x += 50) {
ctx.beginPath();
ctx.moveTo(x, 0);
ctx.lineTo(x, 200);
ctx.stroke();
}
for (let y = 0; y <= 200; y += 50) {
ctx.beginPath();
ctx.moveTo(0, y);
ctx.lineTo(400, y);
ctx.stroke();
}

// Draw labels
ctx.fillStyle = "#000";
ctx.font = "12px sans-serif";
ctx.fillText("1. Blue: translate(50,50)", 10, 15);
ctx.fillText("2. Green: scale(2,2)", 10, 30);
ctx.fillText("3. Red: rotate(45°)", 10, 45);
ctx.fillText("4. Yellow: setTransform(skew)", 10, 60);

// Test 1: Basic translation
ctx.save();
ctx.translate(50, 50);
ctx.fillStyle = "#00F";
ctx.fillRect(0, 0, 30, 30);
ctx.restore();

// Test 2: Scale
ctx.save();
ctx.translate(100, 50);
ctx.scale(2, 2);
ctx.fillStyle = "#0F0";
ctx.fillRect(-15, -15, 15, 15);
ctx.restore();

// Test 3: Rotation
ctx.save();
ctx.translate(150, 50);
ctx.rotate(Math.PI / 4); // 45 degrees
ctx.fillStyle = "#F00";
ctx.fillRect(-10, -10, 20, 20);
ctx.restore();

// Test 4: setTransform (absolute)
ctx.save();
ctx.setTransform(1, 0.2, 0.2, 1, 250, 75);
ctx.fillStyle = "#FF0";
ctx.fillRect(0, 0, 30, 30);
ctx.restore();

// Restore original state (back to world space)
ctx.restore();
}
41 changes: 20 additions & 21 deletions example/index.html
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Original file line number Diff line number Diff line change
@@ -1,35 +1,34 @@
<!DOCTYPE html>
<html lang="en">
<html>
<head>
<title>FarCanvas Example</title>
<style>
body {
background: #CEF;
.canvas-container {
display: flex;
gap: 20px;
margin: 20px;
}
div {
display: inline-block;
canvas {
border: 1px solid #333;
}
#reference_container {
border: solid green 1px;
}
#far_container {
border: solid red 1px;
.canvas-label {
text-align: center;
margin-bottom: 5px;
font-family: sans-serif;
}
</style>
</head>
<body>
<div>
<div id="reference_container" class="canvas_container">
<canvas id="reference" width="8" height="8"></canvas>
<div class="canvas-container">
<div>
<div class="canvas-label">Reference Canvas</div>
<canvas id="reference"></canvas>
</div>
<h3 style="text-align: center">reference</h3>
</div>
<div>
<div id="far_container" class="canvas_container">
<canvas id="far" width="8" height="8"></canvas>
<div>
<div class="canvas-label">Far Canvas</div>
<canvas id="far"></canvas>
</div>
<h3 style="text-align: center">far</h3>
</div>
<script type="application/javascript" src="../lib.web/index.js"></script>
<script type="application/javascript" src="./example.js"></script>
<script type="module" src="example.js"></script>
</body>
</html>
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