catalogued triangle twist

2025-09-27 22:45:25 +00:00 · 2022-03-16 19:33:42 +13:00
parent 70421f763f
commit ec6314dae2
8 changed files with 325 additions and 365 deletions
--- a/Catalogue/square
+++ b/Catalogue/square
@@ -0,0 +1,86 @@
+<!DOCTYPE html>
+<html>
+<!-- ahhh -->
+
+<body style="margin:0;overflow: hidden;">
+  <canvas id="myCanvas" width="10" height="10" style="display: block;box-sizing: border-box;">
+    Your browser does not support the HTML5 canvas tag.</canvas>
+  <script>
+    let c = document.getElementById("myCanvas");
+    let ctx = c.getContext("2d");
+    ctx.canvas.width = window.innerWidth;
+    ctx.canvas.height = window.innerHeight;
+
+
+
+    let deg_per_sec = 30;
+    let time = 120;
+    let fps = 60;
+
+    centerX = ctx.canvas.width / 2;
+    centerY = ctx.canvas.height / 2;
+
+    rotation = 0; //was = j = angle
+    currentFrame = 0; //was = i
+
+
+    let squares = 1;
+    let tmpTimer = 0;
+    render_clear();
+    function render() {
+      if (currentFrame < time / (1 / fps)) {
+        setTimeout(() => {
+          render();
+          render_clear();
+
+          Draw_rectangle_pattern1(rotation, squares, 200, "blue");
+
+          if (tmpTimer >= fps/2 & squares != 40) {
+            tmpTimer = 0;
+            squares += 1;
+          }
+          tmpTimer += 1;
+
+        }, 1000 / fps);
+        rotation += deg_per_sec / fps; // was = j = angle, now = rotation
+        currentFrame += 1; // was = i
+      }
+    }
+
+    render();
+
+
+    function Draw_rectangle_pattern1(rotation, squares, size, colour) {
+      for (let z = 0; z < 360; z += 360 / squares) {
+        drawSquare(z + rotation);
+      }
+
+      function drawSquare(angle) {
+        ctx.save();
+        ctx.translate(centerX, centerY)//-(Math.sin(rad(angle)) *centerX));
+        ctx.rotate(rad(angle + 180));
+        ctx.beginPath();
+        ctx.strokeStyle = colour;
+        ctx.rect(-size, -size, size, size);
+        ctx.stroke();
+        ctx.restore();
+      }
+    }
+
+    function rad(degrees) {
+      var pi = Math.PI;
+      return degrees * (pi / 180);
+    }
+
+
+    function render_clear() {
+      ctx.clearRect(0, 0, ctx.canvas.width, ctx.canvas.height);
+      ctx.fillStyle = "black";
+      ctx.fillRect(0, 0, ctx.canvas.width, ctx.canvas.height);
+    }
+
+
+  </script>
+</body>
+
+</html>