33 lines
939 B
JavaScript
33 lines
939 B
JavaScript
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var Form = function() {
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var move = function(x) { return function(y) { return function(form) {
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var t = form[1];
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return [form[0], [[x + t[0][0], y + t[0][1]], t[1], t[2]]];
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};
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};
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};
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var rotate = function(theta) { return function(form) {
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var t = form[1];
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return [form[0], [t[0], t[1] + 2* Math.PI*theta, t[2]]];
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};
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};
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var scale = function(s) { return function(form) {
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var t = form[1];
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return [form[0], [t[0], t[1], t[2] * s]];
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};
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};
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var create = function(howToDraw, center) {
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return [howToDraw, Transforms.create(center, 0, 1)];
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};
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var draw = function(form) {
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ctx.save();
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var trans = form[1];
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ctx.translate(trans[0][0], trans[0][1]);
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ctx.rotate(trans[1]);
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ctx.scale(trans[2], trans[2]);
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form[0](ctx);
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ctx.restore();
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return ctx;
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};
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return {create:create, move:move, rotate:rotate, scale:scale, draw:draw};
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}();
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