pixel-editor/js/tools/_ellipse.js

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// Saving the empty rect svg
var emptyEllipseSVG = document.getElementById("ellipse-empty-button-svg");
// and the full rect svg so that I can change them when the user changes rect modes
var fullEllipseSVG = document.getElementById("ellipse-full-button-svg");
// The start mode is empty ellipse
var ellipseDrawMode = 'empty';
// I'm not drawing a ellipse at the beginning
var isDrawingEllipse = false;
// Ellipse coordinates
let startEllipseX;
let startEllipseY;
let endEllipseX;
let endEllipseY;
// TODO: [ELLIPSE] Make it draw ellipse instead of copy-pasted rectangle
/** Starts drawing the ellipse, saves the start coordinates
*
* @param {*} mouseEvent
*/
function startEllipseDrawing(mouseEvent) {
// Putting the vfx layer on top of everything
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VFXLayer.canvas.style.zIndex = parseInt(currentLayer.canvas.style.zIndex, 10) + 1;;
// Updating flag
isDrawingEllipse = true;
// Saving the start coords of the ellipse
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let cursorPos = Input.getCursorPosition(mouseEvent);
startEllipseX = Math.floor(cursorPos[0] / zoom) + 0.5;
startEllipseY = Math.floor(cursorPos[1] / zoom) + 0.5;
drawEllipse(startEllipseX, startEllipseY);
}
// TODO: [ELLIPSE] Make it draw ellipse instead of copy-pasted rectangle
/** Updates the ellipse preview depending on the position of the mouse
*
* @param {*} mouseEvent The mouseEvent from which we'll get the mouse position
*/
function updateEllipseDrawing(mouseEvent) {
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let pos = Input.getCursorPosition(mouseEvent);
// Drawing the ellipse at the right position
drawEllipse(Math.round(pos[0] / zoom) + 0.5, Math.round(pos[1] / zoom) + 0.5);
}
// TODO: [ELLIPSE] Make it draw ellipse instead of copy-pasted rectangle
/** Finishes drawing the ellipse, decides the end coordinates and moves the preview ellipse to the
* current layer
*
* @param {*} mouseEvent event from which we'll get the mouse position
*/
function endEllipseDrawing(mouseEvent) {
// Getting the end position
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let currentPos = Input.getCursorPosition(mouseEvent);
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let vfxContext = VFXLayer.context;
endEllipseX = Math.round(currentPos[0] / zoom) + 0.5;
endEllipseY = Math.round(currentPos[1] / zoom) + 0.5;
// Inverting end and start (start must always be the top left corner)
if (endEllipseX < startEllipseX) {
let tmp = endEllipseX;
endEllipseX = startEllipseX;
startEllipseX = tmp;
}
// Same for the y
if (endEllipseY < startEllipseY) {
let tmp = endEllipseY;
endEllipseY = startEllipseY;
startEllipseY = tmp;
}
// Resetting this
isDrawingEllipse = false;
// Drawing the ellipse
startEllipseY -= 0.5;
endEllipseY -= 0.5;
endEllipseX -= 0.5;
startEllipseX -= 0.5;
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// Setting the correct linewidth
currentLayer.context.lineWidth = tool.ellipse.brushSize;
// Drawing the ellipse using 4 lines
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currentLayer.drawLine(startEllipseX, startEllipseY, endEllipseX, startEllipseY, tool.ellipse.brushSize);
currentLayer.drawLine(endEllipseX, startEllipseY, endEllipseX, endEllipseY, tool.ellipse.brushSize);
currentLayer.drawLine(endEllipseX, endEllipseY, startEllipseX, endEllipseY, tool.ellipse.brushSize);
currentLayer.drawLine(startEllipseX, endEllipseY, startEllipseX, startEllipseY, tool.ellipse.brushSize);
// If I have to fill it, I do so
if (ellipseDrawMode == 'fill') {
currentLayer.context.fillRect(startEllipseX, startEllipseY, endEllipseX - startEllipseX, endEllipseY - startEllipseY);
}
// Clearing the vfx canvas
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vfxContext.clearRect(0, 0, VFXLayer.canvas.width, VFXLayer.canvas.height);
}
// TODO: [ELLIPSE] Make it draw ellipse instead of copy-pasted rectangle
/** Draws a ellipse with end coordinates given by x and y on the VFX layer (draws
* the preview for the ellipse tool)
*
* @param {*} x The current end x of the ellipse
* @param {*} y The current end y of the ellipse
*/
function drawEllipse(x, y) {
// Getting the vfx context
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let vfxContext = VFXLayer.context;
// Clearing the vfx canvas
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vfxContext.clearRect(0, 0, VFXLayer.canvas.width, VFXLayer.canvas.height);
// Drawing the ellipse
vfxContext.lineWidth = tool.ellipse.brushSize;
// Drawing the ellipse
vfxContext.beginPath();
if ((tool.ellipse.brushSize % 2 ) == 0) {
vfxContext.rect(startEllipseX - 0.5, startEllipseY - 0.5, x - startEllipseX, y - startEllipseY);
}
else {
vfxContext.rect(startEllipseX, startEllipseY, x - startEllipseX, y - startEllipseY);
}
vfxContext.setLineDash([]);
vfxContext.stroke();
}
/** Sets the correct tool icon depending on its mode
*
*/
function setEllipseToolSvg() {
console.log("set eilipse svg");
if (ellipseDrawMode == 'empty') {
emptyEllipseSVG.setAttribute('display', 'visible');
fullEllipseSVG.setAttribute('display', 'none');
}
else {
emptyEllipseSVG.setAttribute('display', 'none');
fullEllipseSVG.setAttribute('display', 'visible');
}
}