79 lines
2.3 KiB
JavaScript
79 lines
2.3 KiB
JavaScript
function Pointer(offset = new Position(), color = new Color('000000'))
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{
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this.offset = offset;
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this.mirror = null;
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this.position_prev = null;
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this.angle = null;
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this.distance = 0;
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// Parameters
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this.thickness = function()
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{
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var ratio = 10/this.position().distance_to(this.position_prev);
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ratio = ratio > 1 ? 1 : ratio;
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return ronin.brush.size * ratio;
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}
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//
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this.draw = function()
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{
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if(!this.position_prev){this.position_prev = this.position(); }
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var position = this.position();
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this.distance += position.distance_to(this.position_prev);
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ronin.canvas.context().beginPath();
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ronin.canvas.context().globalCompositeOperation="source-over";
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ronin.canvas.context().moveTo(this.position_prev.x,this.position_prev.y);
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ronin.canvas.context().lineTo(position.x,position.y);
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ronin.canvas.context().lineCap="round";
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ronin.canvas.context().lineWidth = this.thickness();
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ronin.canvas.context().strokeStyle = ronin.brush.color.rgba();
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ronin.canvas.context().stroke();
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ronin.canvas.context().closePath();
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this.position_prev = position;
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}
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this.position = function()
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{
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if(this.angle){
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var angle_radian = this.angle.degrees * Math.PI / 180;
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var deltaX = ronin.brush.position.x - this.offset.x;
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var deltaY = ronin.brush.position.y - this.offset.y;
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var t = Math.atan2(deltaY, deltaX) + angle_radian;
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var radius = ronin.brush.position.distance_to(this.offset);
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var x = Math.cos(t) * radius;
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var y = Math.sin(t) * radius;
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return new Position(x + this.offset.x,y + this.offset.y);
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}
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else if(this.mirror && this.mirror.width > 0){
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return new Position((2 * this.mirror.width) - (ronin.brush.position.x + this.offset.x), 0 + (ronin.brush.position.y + this.offset.y));
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}
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else if(this.mirror && this.mirror.height > 0){
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return new Position((ronin.brush.position.x + this.offset.x), (2 * this.mirror.height) - (ronin.brush.position.y + this.offset.y));
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}
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return this.position_default();
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}
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// Effects
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this.position_default = function()
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{
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return ronin.cursor.position.add(this.offset);
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}
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this.start = function()
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{
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}
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this.stop = function()
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{
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this.position_prev = null;
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}
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} |