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feature: support pi rotation #5

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feature: support pi rotation #5

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3565d30
feature: support pi rotation
Jim-Holmstroem Sep 20, 2023
407dba7
fix: missed context.restore()
Jim-Holmstroem Sep 20, 2023
038acce
test: react to changes in index.js
FelixAbrahamsson Sep 21, 2023
aba24c2
feature: nothing works
FelixAbrahamsson Sep 21, 2023
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100 changes: 77 additions & 23 deletions example/example.js
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Original file line number Diff line number Diff line change
@@ -1,13 +1,22 @@
import { far } from "../src/index.js";

const canvasDimensions = { width: 700, height: 1200 };

function getReferenceContext2d(element, transform) {
const context = element.getContext("2d");
context.scale(transform.scale, transform.scale);
context.translate(transform.x, transform.y);

context.translate(transform.rotation.x, transform.rotation.y);
context.rotate(transform.rotation.angle);
context.translate(-transform.rotation.x, -transform.rotation.y);
// context.scale(-1, -1);

return context;
}

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

return context;
}
Expand All @@ -16,17 +25,23 @@ const referenceCanvas = document.getElementById("reference");
const farCanvas = document.getElementById("far");

const image = { data: document.createElement("img"), width: 320, height: 164 };
const canvasDimensions = { width: 700, height: 1200 };

referenceCanvas.width = canvasDimensions.width;
referenceCanvas.height = canvasDimensions.height;
farCanvas.width = canvasDimensions.width;
farCanvas.height = canvasDimensions.height;
referenceCanvas.width = canvasDimensions.width * 2;
referenceCanvas.height = canvasDimensions.height * 2;
farCanvas.width = canvasDimensions.width * 2;
farCanvas.height = canvasDimensions.height * 2;

const scale = canvasDimensions.width / image.width;
const focus = 10000; // 500000000 // breaks down in vanilla canvas
const focus = -0; // 500000000 // breaks down in vanilla canvas
const rotation = {
x: image.width / 2,
// y: focus + image.height / 2,
y: focus,
angle: Math.PI,
// angle: 0,
};

const diff = -image.height * 0;
const diff = -image.height * 3;

const mkImage = ({ x, y, image }) => ({
x,
Expand All @@ -37,35 +52,38 @@ const mkImage = ({ x, y, image }) => ({
});

const images = [
mkImage({ x: 0, y: focus - 1 * image.height, image }),
// mkImage({ x: 0, y: focus - 2 * image.height, image }),
// mkImage({ x: 0, y: focus - 1 * image.height, image }),
mkImage({ x: 0, y: focus + 0 * image.height, image }),
mkImage({ x: 0, y: focus + 1 * image.height, image }),
// mkImage({ x: 0, y: focus + 1 * image.height, image }),
mkImage({ x: 0, y: focus + 2 * image.height, image }),
mkImage({ x: 0, y: focus + 3 * image.height, image }),
mkImage({ x: 0, y: focus + 4 * image.height, image }),
// mkImage({ x: 0, y: focus + 3 * image.height, image }),
// mkImage({ x: 0, y: focus + 4 * image.height, image }),
];

const rectangles = [
{ x: 10, y: focus + 20, width: 200, height: 30 },
{ x: 100, y: focus + 250, width: 200, height: 30 },
{ x: -10, y: focus - 10, width: 200, height: 30 },
{ x: 100, y: focus + 400, width: 200, height: 30 },
{
x: 0,
y: focus + 2 * image.height,
width: image.width,
height: image.height,
},
{ x: 10, y: focus - 200, width: 200, height: 30 },
// { x: 10, y: focus + 20, width: 200, height: 30 },
// { x: 100, y: focus + 250, width: 200, height: 30 },
// { x: -10, y: focus - 10, width: 200, height: 30 },
// { x: 100, y: focus + 400, width: 200, height: 30 },
// {
// x: 0,
// y: focus + 2 * image.height,
// width: image.width,
// height: image.height,
// },
];

const contextReference = getReferenceContext2d(
document.getElementById("reference"),
{ x: 0, y: -focus - diff, scale: scale }
{ x: 0, y: -focus - diff, scale: scale, rotation: rotation }
);
const contextFar = getFarContext2d(document.getElementById("far"), {
x: 0,
y: -focus - diff,
scale: scale,
rotation: rotation,
});

image.data.onload = function () {
Expand Down Expand Up @@ -123,6 +141,42 @@ image.data.onload = function () {

ctx.restore();
});

// focus y
ctx.save();

ctx.beginPath();
ctx.lineWidth = 8;
ctx.strokeStyle = "#0ac";
ctx.moveTo(-2 * image.width, focus);
ctx.lineTo(2 * image.width, focus);

ctx.stroke();
ctx.restore();

// origo
ctx.save();

ctx.beginPath();
ctx.lineWidth = 4;
ctx.strokeStyle = "#f00";
const size = 16;
ctx.arc(0, 0, size, 0, 2 * Math.PI);
ctx.stroke();

ctx.beginPath();
ctx.strokeStyle = "#0f0";
ctx.moveTo(0, 0);
ctx.lineTo(2 * size, 0);
ctx.stroke();

ctx.beginPath();
ctx.strokeStyle = "#00f";
ctx.moveTo(0, 0);
ctx.lineTo(0, 2 * size);
ctx.stroke();

ctx.restore();
}

render(contextReference);
Expand Down
2 changes: 1 addition & 1 deletion example/index.html
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Original file line number Diff line number Diff line change
Expand Up @@ -30,6 +30,6 @@ <h3 style="text-align: center">reference</h3>
<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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