本文整理汇总了TypeScript中tabris.CanvasContext类的典型用法代码示例。如果您正苦于以下问题：TypeScript CanvasContext类的具体用法？TypeScript CanvasContext怎么用？TypeScript CanvasContext使用的例子？那么恭喜您, 这里精选的类代码示例或许可以为您提供帮助。
在下文中一共展示了CanvasContext类的8个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的TypeScript代码示例。
示例1: drawHourLabel
private drawHourLabel(ctx: CanvasContext, hour: number) {
ctx.textAlign = "center";
ctx.textBaseline = "top";
let hourNumber = new Date(hour).getHours();
let hourString = (hourNumber < 10) ? "0" + hourNumber + ":00" : hourNumber + ":00";
ctx.fillText(hourString, this.getX(hour), this.getY(this.scale.minY) + 1);
}示例2: drawHermiteInterpolation
private drawHermiteInterpolation(ctx: CanvasContext, points: Point[]) {
ctx.strokeStyle = graphLineColor;
ctx.lineWidth = graphLineWidth;
for (let i = 0; i < points.length - 1; i++) {
ctx.beginPath();
let [b0, b3] = [points[i], points[i + 1]];
let h = (b3.x - b0.x) / 3;
let b1 = { x: b0.x + h, y: b0.y + (h * b0.dydx) };
let b2 = { x: b3.x - h, y: b3.y - (h * b3.dydx) };
ctx.moveTo(this.getX(b0.x), this.getY(b0.y));
ctx.bezierCurveTo(
this.getX(b1.x), this.getY(b1.y),
this.getX(b2.x), this.getY(b2.y),
this.getX(b3.x), this.getY(b3.y)
);
ctx.stroke();
}
}示例3: drawArea
private drawArea(ctx: CanvasContext, startTime: number, endTime: number, color: string) {
ctx.fillStyle = color;
let graphHeight = this.get("height") - margins.top - margins.bottom;
ctx.fillRect(this.getX(startTime),
this.getY(this.scale.maxY),
this.getX(endTime) - this.getX(startTime),
graphHeight
);
};示例4: drawTemperatureScale
private drawTemperatureScale(ctx: CanvasContext) {
let degreeHeight = this.getY(this.scale.minY) - this.getY(this.scale.minY + 1);
let degreeStep = (degreeHeight > minVerticalDistance) ? 1 : (2 * degreeHeight > minVerticalDistance) ? 2 : 5;
let minHeight = Math.ceil(this.scale.minY / degreeStep) * degreeStep;
ctx.strokeStyle = uiLineColor;
ctx.lineWidth = uiLineWidth;
for (let height = minHeight; height < this.scale.maxY; height += degreeStep) {
// horizontal line
ctx.beginPath();
ctx.moveTo(this.getX(this.scale.minX), this.getY(height));
ctx.lineTo(this.getX(this.scale.maxX), this.getY(height));
ctx.stroke();
// text label
ctx.fillStyle = uiTextColor;
ctx.font = uiFont;
ctx.textAlign = "right";
ctx.textBaseline = "middle";
ctx.fillText(height + "°C", this.getX(this.scale.minX) - 2, this.getY(height));
}
}示例5: drawPoint
private drawPoint(ctx: CanvasContext, point: Point) {
ctx.fillStyle = graphLineColor;
ctx.fillRect(this.getX(point.x) - 2, this.getY(point.y) - 2, 4, 4);
}示例6: drawDayLabel
private drawDayLabel(ctx: CanvasContext, day: number) {
ctx.textAlign = "left";
ctx.textBaseline = "bottom";
let dayName = daysNames[new Date(day).getDay()];
ctx.fillText(dayName, this.getX(day) + 3, this.getY(this.scale.maxY) + 1);
}示例7: drawVerticalLine
private drawVerticalLine(ctx: CanvasContext, time: number, extraLength: number) {
ctx.beginPath();
ctx.moveTo(this.getX(time), this.getY(this.scale.minY));
ctx.lineTo(this.getX(time), this.getY(this.scale.maxY) - extraLength);
ctx.stroke();
}示例8: Canvas
import {Canvas, CanvasContext, ImageData, ColorValue, FontValue} from 'tabris';
let ctx: CanvasContext = new Canvas().getContext('2d', 100, 100);
// Properties
let fillStyle: ColorValue;
let font: FontValue;
let lineCap: 'butt' | 'round' | 'square';
let lineJoin: 'bevel' | 'miter' | 'round';
let lineWidth: number;
let strokeStyle: ColorValue;
let textAlign: 'center' | 'end' | 'left' | 'right' | 'start';
let textBaseline: 'alphabetic' | 'bottom' | 'hanging' | 'ideographic' | 'middle' | 'top';
fillStyle = ctx.fillStyle;
font = ctx.font;
lineCap = ctx.lineCap;
lineJoin = ctx.lineJoin;
lineWidth = ctx.lineWidth;
strokeStyle = ctx.strokeStyle;
textAlign = ctx.textAlign;
textBaseline = ctx.textBaseline;
ctx.fillStyle = fillStyle;
ctx.font = font;
ctx.lineCap = lineCap;
ctx.lineJoin = lineJoin;
ctx.lineWidth = lineWidth;
ctx.strokeStyle = strokeStyle;
ctx.textAlign = textAlign;
ctx.textBaseline = textBaseline;